56517671531 has 4 divisors (see below), whose sum is σ = 56540827464. Its totient is φ = 56494515600.

The previous prime is 56517671519. The next prime is 56517671537. The reversal of 56517671531 is 13517671565.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56517671531 is a prime.

It is a super-2 number, since 2×56517671531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56517671537) 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, 11574305 + ... + 11579186.

It is an arithmetic number, because the mean of its divisors is an integer number (14135206866).

Almost surely, 2^56517671531 is an apocalyptic number.

56517671531 is a deficient number, since it is larger than the sum of its proper divisors (23155933).

56517671531 is a wasteful number, since it uses less digits than its factorization.

56517671531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23155932.

The product of its digits is 661500, while the sum is 47.

The spelling of 56517671531 in words is "fifty-six billion, five hundred seventeen million, six hundred seventy-one thousand, five hundred thirty-one".