31211123111257 has 2 divisors, whose sum is σ = 31211123111258. Its totient is φ = 31211123111256.

The previous prime is 31211123111243. The next prime is 31211123111299. The reversal of 31211123111257 is 75211132111213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20908204357401 + 10302918753856 = 4572549^2 + 3209816^2 .

It is a cyclic number.

It is not a de Polignac number, because 31211123111257 - 2³⁵ = 31176763372889 is a prime.

It is not a weakly prime, because it can be changed into another prime (31211123111237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15605561555628 + 15605561555629.

It is an arithmetic number, because the mean of its divisors is an integer number (15605561555629).

Almost surely, 2^{31211123111257} is an apocalyptic number.

It is an amenable number.

31211123111257 is a deficient number, since it is larger than the sum of its proper divisors (1).

31211123111257 is an equidigital number, since it uses as much as digits as its factorization.

31211123111257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 31.

The spelling of 31211123111257 in words is "thirty-one trillion, two hundred eleven billion, one hundred twenty-three million, one hundred eleven thousand, two hundred fifty-seven".