56815549 has 16 divisors (see below), whose sum is σ = 67219200. Its totient is φ = 47992560.

The previous prime is 56815541. The next prime is 56815559. The reversal of 56815549 is 94551865.

It is not a de Polignac number, because 56815549 - 2³ = 56815541 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 (56815541) 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, 23187 + ... + 25519.

It is an arithmetic number, because the mean of its divisors is an integer number (4201200).

Almost surely, 2^56815549 is an apocalyptic number.

It is an amenable number.

56815549 is a deficient number, since it is larger than the sum of its proper divisors (10403651).

56815549 is an equidigital number, since it uses as much as digits as its factorization.

56815549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425 (or 2411 counting only the distinct ones).

The product of its digits is 216000, while the sum is 43.

The square root of 56815549 is about 7537.6089710199. The cubic root of 56815549 is about 384.4345418062.

The spelling of 56815549 in words is "fifty-six million, eight hundred fifteen thousand, five hundred forty-nine".