311123 has 2 divisors, whose sum is σ = 311124. Its totient is φ = 311122.

The previous prime is 311111. The next prime is 311137. The reversal of 311123 is 321113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 311123 - 2⁸ = 310867 is a prime.

It is a super-2 number, since 2×311123² = 193595042258, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (311153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155561 + 155562.

It is an arithmetic number, because the mean of its divisors is an integer number (155562).

2³¹¹¹²³ is an apocalyptic number.

311123 is a deficient number, since it is larger than the sum of its proper divisors (1).

311123 is an equidigital number, since it uses as much as digits as its factorization.

311123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18, while the sum is 11.

The square root of 311123 is about 557.7840083760. The cubic root of 311123 is about 67.7606202402.

Adding to 311123 its reverse (321113), we get a palindrome (632236).

It can be divided in two parts, 311 and 123, that added together give a palindrome (434).

The spelling of 311123 in words is "three hundred eleven thousand, one hundred twenty-three", and thus it is an iban number.