5631613581 has 12 divisors (see below), whose sum is σ = 8253494816. Its totient is φ = 3413098920.

The previous prime is 5631613577. The next prime is 5631613591. The reversal of 5631613581 is 1853161365.

It is not a de Polignac number, because 5631613581 - 2² = 5631613577 is a prime.

It is a super-2 number, since 2×5631613581² = 63430143051407287122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5631613591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7756681 + ... + 7757406.

Almost surely, 2^5631613581 is an apocalyptic number.

It is an amenable number.

5631613581 is a deficient number, since it is larger than the sum of its proper divisors (2621881235).

5631613581 is a wasteful number, since it uses less digits than its factorization.

5631613581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15514112 (or 15514101 counting only the distinct ones).

The product of its digits is 64800, while the sum is 39.

The square root of 5631613581 is about 75044.0775877750. The cubic root of 5631613581 is about 1779.1433807974.

The spelling of 5631613581 in words is "five billion, six hundred thirty-one million, six hundred thirteen thousand, five hundred eighty-one".