56511977 has 4 divisors (see below), whose sum is σ = 58334976. Its totient is φ = 54688980.

The previous prime is 56511971. The next prime is 56511997. The reversal of 56511977 is 77911565.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56511977 - 2¹⁰ = 56510953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56511971) 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, 911453 + ... + 911514.

It is an arithmetic number, because the mean of its divisors is an integer number (14583744).

Almost surely, 2^56511977 is an apocalyptic number.

It is an amenable number.

56511977 is a deficient number, since it is larger than the sum of its proper divisors (1822999).

56511977 is a wasteful number, since it uses less digits than its factorization.

56511977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1822998.

The product of its digits is 66150, while the sum is 41.

The square root of 56511977 is about 7517.4448451585. Note that the first 3 decimals coincide. The cubic root of 56511977 is about 383.7486260813.

The spelling of 56511977 in words is "fifty-six million, five hundred eleven thousand, nine hundred seventy-seven".