31187405457 has 40 divisors (see below), whose sum is σ = 51339204224. Its totient is φ = 18745890912.

The previous prime is 31187405443. The next prime is 31187405497. The reversal of 31187405457 is 75450478113.

31187405457 is a `hidden beast` number, since 31 + 1 + 8 + 74 + 0 + 545 + 7 = 666.

It is not a de Polignac number, because 31187405457 - 2⁶ = 31187405393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31187405497) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 299113 + ... + 389670.

Almost surely, 2^31187405457 is an apocalyptic number.

It is an amenable number.

31187405457 is a deficient number, since it is larger than the sum of its proper divisors (20151798767).

31187405457 is a wasteful number, since it uses less digits than its factorization.

31187405457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688851 (or 688842 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 45.

The spelling of 31187405457 in words is "thirty-one billion, one hundred eighty-seven million, four hundred five thousand, four hundred fifty-seven".