561591613 has 12 divisors (see below), whose sum is σ = 623411964. Its totient is φ = 505472000.

The previous prime is 561591601. The next prime is 561591619. The reversal of 561591613 is 316195165.

It can be written as a sum of positive squares in 2 ways, for example, as 382085209 + 179506404 = 19547^2 + 13398^2 .

It is not a de Polignac number, because 561591613 - 2²⁹ = 24720701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561591619) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10756 + ... + 35197.

It is an arithmetic number, because the mean of its divisors is an integer number (51950997).

Almost surely, 2^561591613 is an apocalyptic number.

It is an amenable number.

561591613 is a deficient number, since it is larger than the sum of its proper divisors (61820351).

561591613 is a wasteful number, since it uses less digits than its factorization.

561591613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46076 (or 46065 counting only the distinct ones).

The product of its digits is 24300, while the sum is 37.

The square root of 561591613 is about 23697.9242339915. The cubic root of 561591613 is about 825.0372131362.

The spelling of 561591613 in words is "five hundred sixty-one million, five hundred ninety-one thousand, six hundred thirteen".