56918309 has 16 divisors (see below), whose sum is σ = 66526848. Its totient is φ = 47691072.

The previous prime is 56918299. The next prime is 56918317. The reversal of 56918309 is 90381965.

56918309 is nontrivially palindromic in base 14.

It is a cyclic number.

It is not a de Polignac number, because 56918309 - 2⁴ = 56918293 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 (56918359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73247 + ... + 74019.

It is an arithmetic number, because the mean of its divisors is an integer number (4157928).

Almost surely, 2^56918309 is an apocalyptic number.

It is an amenable number.

56918309 is a deficient number, since it is larger than the sum of its proper divisors (9608539).

56918309 is a wasteful number, since it uses less digits than its factorization.

56918309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 56918309 is about 7544.4223768291. The cubic root of 56918309 is about 384.6661726501. Note that the first 3 decimals are identical.

The spelling of 56918309 in words is "fifty-six million, nine hundred eighteen thousand, three hundred nine".