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← 310 311 312 →
List of numbers; Integers; ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	three hundred eleven
Ordinal	311th; (three hundred eleventh)
Factorization	prime
Prime	64th
Greek numeral	ΤΙΑ´
Roman numeral	CCCXI, cccxi
Binary	1001101112
Ternary	1021123
Senary	12356
Octal	4678
Duodecimal	21B12
Hexadecimal	13716
Hebrew	שיא

311 (three hundred [and] eleven) is the natural number following 310 and preceding 312.

311 is the 64th prime; a twin prime with 313; an irregular prime;^[1] an emirp, an Eisenstein prime with no imaginary part and real part of the form $3n-1$ ; a Gaussian prime with no imaginary part and real part of the form $4n-1$ ; and a permutable prime with 113 and 131.

It can be expressed as a sum of consecutive primes in four different ways: as a sum of three consecutive primes (101 + 103 + 107), as a sum of five consecutive primes (53 + 59 + 61 + 67 + 71), as a sum of seven consecutive primes (31 + 37 + 41 + 43 + 47 + 53 + 59), and as a sum of eleven consecutive primes (11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43 + 47).

311 is a strictly non-palindromic number, as it is not palindromic in any base between base 2 and base 309.^[2]

311 is the smallest positive integer d such that the imaginary quadratic field Q(√–d) has class number = 19.^[3]

4³¹¹ - 3³¹¹ is prime