31715887457 has 4 divisors (see below), whose sum is σ = 31750399680. Its totient is φ = 31681375236.

The previous prime is 31715887447. The next prime is 31715887519. The reversal of 31715887457 is 75478851713.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75478851713 = 751 ⋅100504463.

It is a cyclic number.

It is not a de Polignac number, because 31715887457 - 2¹⁴ = 31715871073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31715887447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17254733 + ... + 17256570.

It is an arithmetic number, because the mean of its divisors is an integer number (7937599920).

Almost surely, 2^31715887457 is an apocalyptic number.

It is an amenable number.

31715887457 is a deficient number, since it is larger than the sum of its proper divisors (34512223).

31715887457 is an equidigital number, since it uses as much as digits as its factorization.

31715887457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34512222.

The product of its digits is 6585600, while the sum is 56.

The spelling of 31715887457 in words is "thirty-one billion, seven hundred fifteen million, eight hundred eighty-seven thousand, four hundred fifty-seven".