56221165 has 64 divisors (see below), whose sum is σ = 92897280. Its totient is φ = 31530240.

The previous prime is 56221163. The next prime is 56221189. The reversal of 56221165 is 56112265.

It is not a de Polignac number, because 56221165 - 2¹ = 56221163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56221163) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 235116 + ... + 235354.

It is an arithmetic number, because the mean of its divisors is an integer number (1451520).

Almost surely, 2^56221165 is an apocalyptic number.

56221165 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

56221165 is a deficient number, since it is larger than the sum of its proper divisors (36676115).

56221165 is a wasteful number, since it uses less digits than its factorization.

56221165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322.

The product of its digits is 3600, while the sum is 28.

The square root of 56221165 is about 7498.0774202458. The cubic root of 56221165 is about 383.0892337989.

Subtracting from 56221165 its reverse (56112265), we obtain a square (108900 = 330²).

The spelling of 56221165 in words is "fifty-six million, two hundred twenty-one thousand, one hundred sixty-five".