311231057 has 2 divisors, whose sum is σ = 311231058. Its totient is φ = 311231056.

The previous prime is 311231029. The next prime is 311231069. The reversal of 311231057 is 750132113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 310605376 + 625681 = 17624^2 + 791^2 .

It is an emirp because it is prime and its reverse (750132113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311231057 is a prime.

It is not a weakly prime, because it can be changed into another prime (311231017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155615528 + 155615529.

It is an arithmetic number, because the mean of its divisors is an integer number (155615529).

Almost surely, 2^311231057 is an apocalyptic number.

It is an amenable number.

311231057 is a deficient number, since it is larger than the sum of its proper divisors (1).

311231057 is an equidigital number, since it uses as much as digits as its factorization.

311231057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 311231057 is about 17641.7418924550. The cubic root of 311231057 is about 677.6846404245.

The spelling of 311231057 in words is "three hundred eleven million, two hundred thirty-one thousand, fifty-seven".