565916521 has 3 divisors (see below), whose sum is σ = 565940311. Its totient is φ = 565892732.

The previous prime is 565916509. The next prime is 565916537. The reversal of 565916521 is 125619565.

The square root of 565916521 is 23789.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 100220121 + 465696400 = 10011^2 + 21580^2 .

It is not a de Polignac number, because 565916521 - 2⁵ = 565916489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (565916321) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 11895 + ... + 35683.

Almost surely, 2^565916521 is an apocalyptic number.

565916521 is the 23789-th square number.

565916521 is the 11895-th centered octagonal number.

It is an amenable number.

565916521 is a deficient number, since it is larger than the sum of its proper divisors (23790).

565916521 is an frugal number, since it uses more digits than its factorization.

565916521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47578 (or 23789 counting only the distinct ones).

The product of its digits is 81000, while the sum is 40.

The cubic root of 565916521 is about 827.1497145593.

The spelling of 565916521 in words is "five hundred sixty-five million, nine hundred sixteen thousand, five hundred twenty-one".