56561943 has 16 divisors (see below), whose sum is σ = 77091840. Its totient is φ = 36876864.

The previous prime is 56561909. The next prime is 56561951. The reversal of 56561943 is 34916565.

It is not a de Polignac number, because 56561943 - 2²² = 52367639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56561963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38755 + ... + 40187.

It is an arithmetic number, because the mean of its divisors is an integer number (4818240).

Almost surely, 2^56561943 is an apocalyptic number.

56561943 is a deficient number, since it is larger than the sum of its proper divisors (20529897).

56561943 is a wasteful number, since it uses less digits than its factorization.

56561943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718.

The product of its digits is 97200, while the sum is 39.

The square root of 56561943 is about 7520.7674475415. The cubic root of 56561943 is about 383.8616919983.

The spelling of 56561943 in words is "fifty-six million, five hundred sixty-one thousand, nine hundred forty-three".