56815547 has 4 divisors (see below), whose sum is σ = 60157656. Its totient is φ = 53473440.

The previous prime is 56815541. The next prime is 56815559. The reversal of 56815547 is 74551865.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74551865 = 5 ⋅14910373.

It is a cyclic number.

It is not a de Polignac number, because 56815547 - 2⁶ = 56815483 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 1671029 + ... + 1671062.

It is an arithmetic number, because the mean of its divisors is an integer number (15039414).

Almost surely, 2^56815547 is an apocalyptic number.

56815547 is a deficient number, since it is larger than the sum of its proper divisors (3342109).

56815547 is a wasteful number, since it uses less digits than its factorization.

56815547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3342108.

The product of its digits is 168000, while the sum is 41.

The square root of 56815547 is about 7537.6088383519. The cubic root of 56815547 is about 384.4345372953.

The spelling of 56815547 in words is "fifty-six million, eight hundred fifteen thousand, five hundred forty-seven".