56513209 has 4 divisors (see below), whose sum is σ = 57471120. Its totient is φ = 55555300.

The previous prime is 56513207. The next prime is 56513251. The reversal of 56513209 is 90231565.

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 56513209 - 2¹ = 56513207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56513207) 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, 478867 + ... + 478984.

It is an arithmetic number, because the mean of its divisors is an integer number (14367780).

Almost surely, 2^56513209 is an apocalyptic number.

56513209 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

It is an amenable number.

56513209 is a deficient number, since it is larger than the sum of its proper divisors (957911).

56513209 is an equidigital number, since it uses as much as digits as its factorization.

56513209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957910.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 56513209 is about 7517.5267874481. The cubic root of 56513209 is about 383.7514147224.

The spelling of 56513209 in words is "fifty-six million, five hundred thirteen thousand, two hundred nine".