56815247 has 4 divisors (see below), whose sum is σ = 57036576. Its totient is φ = 56593920.

The previous prime is 56815201. The next prime is 56815259. The reversal of 56815247 is 74251865.

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

It is a cyclic number.

It is not a de Polignac number, because 56815247 - 2⁶ = 56815183 is a prime.

It is a super-3 number, since 3×56815247³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56815247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56515247) 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, 110279 + ... + 110792.

It is an arithmetic number, because the mean of its divisors is an integer number (14259144).

Almost surely, 2^56815247 is an apocalyptic number.

56815247 is a deficient number, since it is larger than the sum of its proper divisors (221329).

56815247 is a wasteful number, since it uses less digits than its factorization.

56815247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221328.

The product of its digits is 67200, while the sum is 38.

The square root of 56815247 is about 7537.5889381154. The cubic root of 56815247 is about 384.4338606579.

The spelling of 56815247 in words is "fifty-six million, eight hundred fifteen thousand, two hundred forty-seven".