56572121 has 4 divisors (see below), whose sum is σ = 56593152. Its totient is φ = 56551092.

The previous prime is 56572097. The next prime is 56572163. The reversal of 56572121 is 12127565.

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 56572121 - 2⁶ = 56572057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56572421) 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, 5765 + ... + 12098.

It is an arithmetic number, because the mean of its divisors is an integer number (14148288).

Almost surely, 2^56572121 is an apocalyptic number.

It is an amenable number.

56572121 is a deficient number, since it is larger than the sum of its proper divisors (21031).

56572121 is a wasteful number, since it uses less digits than its factorization.

56572121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21030.

The product of its digits is 4200, while the sum is 29.

The square root of 56572121 is about 7521.4440767714. Note that the first 3 decimals coincide. The cubic root of 56572121 is about 383.8847151936.

Adding to 56572121 its reverse (12127565), we get a palindrome (68699686).

The spelling of 56572121 in words is "fifty-six million, five hundred seventy-two thousand, one hundred twenty-one".