56442991 has 12 divisors (see below), whose sum is σ = 62546176. Its totient is φ = 50893920.

The previous prime is 56442979. The next prime is 56443001. The reversal of 56442991 is 19924465.

It is not a de Polignac number, because 56442991 - 2⁵ = 56442959 is a prime.

It is a super-2 number, since 2×56442991² = 6371622466052162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56442931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13531 + ... + 17203.

Almost surely, 2^56442991 is an apocalyptic number.

56442991 is a deficient number, since it is larger than the sum of its proper divisors (6103185).

56442991 is a wasteful number, since it uses less digits than its factorization.

56442991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3822 (or 3811 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 56442991 is about 7512.8550498462. The cubic root of 56442991 is about 383.5924110410.

The spelling of 56442991 in words is "fifty-six million, four hundred forty-two thousand, nine hundred ninety-one".