56426509 has 4 divisors (see below), whose sum is σ = 56496060. Its totient is φ = 56356960.

The previous prime is 56426483. The next prime is 56426533. The reversal of 56426509 is 90562465.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25100100 + 31326409 = 5010^2 + 5597^2 .

It is a cyclic number.

It is not a de Polignac number, because 56426509 - 2⁵ = 56426477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56420509) 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, 33544 + ... + 35185.

It is an arithmetic number, because the mean of its divisors is an integer number (14124015).

Almost surely, 2^56426509 is an apocalyptic number.

It is an amenable number.

56426509 is a deficient number, since it is larger than the sum of its proper divisors (69551).

56426509 is an equidigital number, since it uses as much as digits as its factorization.

56426509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69550.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 56426509 is about 7511.7580498842. The cubic root of 56426509 is about 383.5550696132. Note that the first 3 decimals are identical.

The spelling of 56426509 in words is "fifty-six million, four hundred twenty-six thousand, five hundred nine".