565535961 has 9 divisors (see below), whose sum is σ = 816988341. Its totient is φ = 376976412.

The previous prime is 565535951. The next prime is 565535963. The reversal of 565535961 is 169535565.

It is a happy number.

The square root of 565535961 is 23781.

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

565535961 is a `hidden beast` number, since 5 + 6 + 5 + 53 + 596 + 1 = 666.

565535961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 565535961 - 2⁷ = 565535833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (565535963) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 67380 + ... + 75306.

Almost surely, 2^565535961 is an apocalyptic number.

565535961 is the 23781-st square number.

565535961 is the 11891-st centered octagonal number.

It is an amenable number.

565535961 is a deficient number, since it is larger than the sum of its proper divisors (251452380).

565535961 is an frugal number, since it uses more digits than its factorization.

565535961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15860 (or 7930 counting only the distinct ones).

The product of its digits is 607500, while the sum is 45.

The cubic root of 565535961 is about 826.9642627775.

It can be divided in two parts, 5655 and 35961, that added together give a triangular number (41616 = T₂₈₈).

The spelling of 565535961 in words is "five hundred sixty-five million, five hundred thirty-five thousand, nine hundred sixty-one".