56682991 has 4 divisors (see below), whose sum is σ = 56709072. Its totient is φ = 56656912.

The previous prime is 56682979. The next prime is 56683013. The reversal of 56682991 is 19928665.

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

It is a cyclic number.

It is not a de Polignac number, because 56682991 - 2⁷ = 56682863 is a prime.

It is a super-2 number, since 2×56682991² = 6425922937412162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56682191) 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, 9451 + ... + 14236.

It is an arithmetic number, because the mean of its divisors is an integer number (14177268).

Almost surely, 2^56682991 is an apocalyptic number.

56682991 is a deficient number, since it is larger than the sum of its proper divisors (26081).

56682991 is a wasteful number, since it uses less digits than its factorization.

56682991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26080.

The product of its digits is 233280, while the sum is 46.

The square root of 56682991 is about 7528.8107294579. The cubic root of 56682991 is about 384.1353305379.

The spelling of 56682991 in words is "fifty-six million, six hundred eighty-two thousand, nine hundred ninety-one".