56717521 has 8 divisors (see below), whose sum is σ = 64868864. Its totient is φ = 48578400.

The previous prime is 56717519. The next prime is 56717537. The reversal of 56717521 is 12571765.

It is a happy number.

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 56717521 - 2¹ = 56717519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56717501) 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, 11581 + ... + 15733.

It is an arithmetic number, because the mean of its divisors is an integer number (8108608).

Almost surely, 2^56717521 is an apocalyptic number.

It is an amenable number.

56717521 is a deficient number, since it is larger than the sum of its proper divisors (8151343).

56717521 is a wasteful number, since it uses less digits than its factorization.

56717521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6111.

The product of its digits is 14700, while the sum is 34.

The square root of 56717521 is about 7531.1035711906. The cubic root of 56717521 is about 384.2133168981.

The spelling of 56717521 in words is "fifty-six million, seven hundred seventeen thousand, five hundred twenty-one".