311485231 has 2 divisors, whose sum is σ = 311485232. Its totient is φ = 311485230.

The previous prime is 311485217. The next prime is 311485247. The reversal of 311485231 is 132584113.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (132584113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311485231 - 2⁷ = 311485103 is a prime.

It is a super-2 number, since 2×311485231² = 194046098262246722, which contains 22 as substring.

It is equal to p_16840324 and since 311485231 and 16840324 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311485231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311485631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155742615 + 155742616.

It is an arithmetic number, because the mean of its divisors is an integer number (155742616).

Almost surely, 2^311485231 is an apocalyptic number.

311485231 is a deficient number, since it is larger than the sum of its proper divisors (1).

311485231 is an equidigital number, since it uses as much as digits as its factorization.

311485231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 28.

The square root of 311485231 is about 17648.9441893842. The cubic root of 311485231 is about 677.8690724754.

The spelling of 311485231 in words is "three hundred eleven million, four hundred eighty-five thousand, two hundred thirty-one".