56685971 has 4 divisors (see below), whose sum is σ = 56712000. Its totient is φ = 56659944.

The previous prime is 56685917. The next prime is 56685983. The reversal of 56685971 is 17958665.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17958665 = 5 ⋅3591733.

It is a cyclic number.

It is not a de Polignac number, because 56685971 - 2¹⁸ = 56423827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56685571) 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, 9416 + ... + 14213.

It is an arithmetic number, because the mean of its divisors is an integer number (14178000).

Almost surely, 2^56685971 is an apocalyptic number.

56685971 is a deficient number, since it is larger than the sum of its proper divisors (26029).

56685971 is a wasteful number, since it uses less digits than its factorization.

56685971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26028.

The product of its digits is 453600, while the sum is 47.

The square root of 56685971 is about 7529.0086332797. The cubic root of 56685971 is about 384.1420621471.

The spelling of 56685971 in words is "fifty-six million, six hundred eighty-five thousand, nine hundred seventy-one".