56215209 has 8 divisors (see below), whose sum is σ = 79362720. Its totient is φ = 35272256.

The previous prime is 56215189. The next prime is 56215213. The reversal of 56215209 is 90251265.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56215209 - 2⁵ = 56215177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56215279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 551079 + ... + 551180.

It is an arithmetic number, because the mean of its divisors is an integer number (9920340).

Almost surely, 2^56215209 is an apocalyptic number.

It is an amenable number.

56215209 is a deficient number, since it is larger than the sum of its proper divisors (23147511).

56215209 is a wasteful number, since it uses less digits than its factorization.

56215209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102279.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 56215209 is about 7497.6802412480. The cubic root of 56215209 is about 383.0757053228.

It can be divided in two parts, 562 and 15209, that multiplied together give a palindrome (8547458).

The spelling of 56215209 in words is "fifty-six million, two hundred fifteen thousand, two hundred nine".