565320261 has 16 divisors (see below), whose sum is σ = 870654528. Its totient is φ = 322464000.

The previous prime is 565320199. The next prime is 565320317. The reversal of 565320261 is 162023565.

It is a de Polignac number, because none of the positive numbers 2^k-565320261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (565300261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 503290 + ... + 504411.

It is an arithmetic number, because the mean of its divisors is an integer number (54415908).

Almost surely, 2^565320261 is an apocalyptic number.

565320261 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

565320261 is a deficient number, since it is larger than the sum of its proper divisors (305334267).

565320261 is a wasteful number, since it uses less digits than its factorization.

565320261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007732.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 565320261 is about 23776.4644343939. The cubic root of 565320261 is about 826.8591124501.

The spelling of 565320261 in words is "five hundred sixty-five million, three hundred twenty thousand, two hundred sixty-one".