56891309 has 8 divisors (see below), whose sum is σ = 57826560. Its totient is φ = 55960416.

The previous prime is 56891269. The next prime is 56891323. The reversal of 56891309 is 90319865.

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 56891309 - 2⁸ = 56891053 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 (56896309) 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, 34154 + ... + 35780.

It is an arithmetic number, because the mean of its divisors is an integer number (7228320).

Almost surely, 2^56891309 is an apocalyptic number.

It is an amenable number.

56891309 is a deficient number, since it is larger than the sum of its proper divisors (935251).

56891309 is a wasteful number, since it uses less digits than its factorization.

56891309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2179.

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

The square root of 56891309 is about 7542.6327631670. The cubic root of 56891309 is about 384.6053390946.

The spelling of 56891309 in words is "fifty-six million, eight hundred ninety-one thousand, three hundred nine".