56021951 has 4 divisors (see below), whose sum is σ = 58457712. Its totient is φ = 53586192.

The previous prime is 56021923. The next prime is 56021963. The reversal of 56021951 is 15912065.

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 56021951 - 2¹⁰ = 56020927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56021921) 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, 1217846 + ... + 1217891.

It is an arithmetic number, because the mean of its divisors is an integer number (14614428).

Almost surely, 2^56021951 is an apocalyptic number.

56021951 is a deficient number, since it is larger than the sum of its proper divisors (2435761).

56021951 is a wasteful number, since it uses less digits than its factorization.

56021951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2435760.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 56021951 is about 7484.7812927299. The cubic root of 56021951 is about 382.6362190152.

The spelling of 56021951 in words is "fifty-six million, twenty-one thousand, nine hundred fifty-one".