52565521 has 4 divisors (see below), whose sum is σ = 52580592. Its totient is φ = 52550452.

The previous prime is 52565509. The next prime is 52565543. The reversal of 52565521 is 12556525.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52565521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52563521) 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, 690 + ... + 10276.

It is an arithmetic number, because the mean of its divisors is an integer number (13145148).

Almost surely, 2^52565521 is an apocalyptic number.

It is an amenable number.

52565521 is a deficient number, since it is larger than the sum of its proper divisors (15071).

52565521 is an equidigital number, since it uses as much as digits as its factorization.

52565521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15070.

The product of its digits is 15000, while the sum is 31.

The square root of 52565521 is about 7250.2083418340. The cubic root of 52565521 is about 374.5993255272.

The spelling of 52565521 in words is "fifty-two million, five hundred sixty-five thousand, five hundred twenty-one".