56216971 has 4 divisors (see below), whose sum is σ = 56527744. Its totient is φ = 55906200.

The previous prime is 56216921. The next prime is 56216987. The reversal of 56216971 is 17961265.

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 56216971 - 2⁷ = 56216843 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56216971.

It is not an unprimeable number, because it can be changed into a prime (56216921) 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, 155115 + ... + 155476.

It is an arithmetic number, because the mean of its divisors is an integer number (14131936).

Almost surely, 2^56216971 is an apocalyptic number.

56216971 is a deficient number, since it is larger than the sum of its proper divisors (310773).

56216971 is a wasteful number, since it uses less digits than its factorization.

56216971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310772.

The product of its digits is 22680, while the sum is 37.

The square root of 56216971 is about 7497.7977433377. The cubic root of 56216971 is about 383.0797076344.

The spelling of 56216971 in words is "fifty-six million, two hundred sixteen thousand, nine hundred seventy-one".