56138971 has 16 divisors (see below), whose sum is σ = 66140608. Its totient is φ = 46656000.

The previous prime is 56138917. The next prime is 56138987. The reversal of 56138971 is 17983165.

It is a 9-Lehmer number, since φ(56138971) divides (56138971-1)⁹.

It is a cyclic number.

It is not a de Polignac number, because 56138971 - 2⁷ = 56138843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56138671) 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, 30271 + ... + 32071.

It is an arithmetic number, because the mean of its divisors is an integer number (4133788).

Almost surely, 2^56138971 is an apocalyptic number.

56138971 is a deficient number, since it is larger than the sum of its proper divisors (10001637).

56138971 is a wasteful number, since it uses less digits than its factorization.

56138971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1942.

The product of its digits is 45360, while the sum is 40.

The square root of 56138971 is about 7492.5944104829. The cubic root of 56138971 is about 382.9024536442.

The spelling of 56138971 in words is "fifty-six million, one hundred thirty-eight thousand, nine hundred seventy-one".