31131433412857 has 2 divisors, whose sum is σ = 31131433412858. Its totient is φ = 31131433412856.

The previous prime is 31131433412801. The next prime is 31131433412879. The reversal of 31131433412857 is 75821433413113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16077180852496 + 15054252560361 = 4009636^2 + 3879981^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31131433412857 is a prime.

It is a super-2 number, since 2×31131433412857² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31131433412357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15565716706428 + 15565716706429.

It is an arithmetic number, because the mean of its divisors is an integer number (15565716706429).

Almost surely, 2^{31131433412857} is an apocalyptic number.

It is an amenable number.

31131433412857 is a deficient number, since it is larger than the sum of its proper divisors (1).

31131433412857 is an equidigital number, since it uses as much as digits as its factorization.

31131433412857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 46.

The spelling of 31131433412857 in words is "thirty-one trillion, one hundred thirty-one billion, four hundred thirty-three million, four hundred twelve thousand, eight hundred fifty-seven".