31555345457 has 2 divisors, whose sum is σ = 31555345458. Its totient is φ = 31555345456.

The previous prime is 31555345441. The next prime is 31555345477. The reversal of 31555345457 is 75454355513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22444833856 + 9110511601 = 149816^2 + 95449^2 .

It is a cyclic number.

It is not a de Polignac number, because 31555345457 - 2⁴ = 31555345441 is a prime.

It is a super-2 number, since 2×31555345457² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31555345477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15777672728 + 15777672729.

It is an arithmetic number, because the mean of its divisors is an integer number (15777672729).

Almost surely, 2^31555345457 is an apocalyptic number.

It is an amenable number.

31555345457 is a deficient number, since it is larger than the sum of its proper divisors (1).

31555345457 is an equidigital number, since it uses as much as digits as its factorization.

31555345457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3150000, while the sum is 47.

The spelling of 31555345457 in words is "thirty-one billion, five hundred fifty-five million, three hundred forty-five thousand, four hundred fifty-seven".