561147965 has 32 divisors (see below), whose sum is σ = 779041536. Its totient is φ = 380090880.

The previous prime is 561147947. The next prime is 561147989. The reversal of 561147965 is 569741165.

It is not a de Polignac number, because 561147965 - 2²⁶ = 494039101 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1792649 + ... + 1792961.

It is an arithmetic number, because the mean of its divisors is an integer number (24345048).

Almost surely, 2^561147965 is an apocalyptic number.

It is an amenable number.

561147965 is a deficient number, since it is larger than the sum of its proper divisors (217893571).

561147965 is a wasteful number, since it uses less digits than its factorization.

561147965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789.

The product of its digits is 226800, while the sum is 44.

The square root of 561147965 is about 23688.5619023190. The cubic root of 561147965 is about 824.8199006929.

The spelling of 561147965 in words is "five hundred sixty-one million, one hundred forty-seven thousand, nine hundred sixty-five".