52661631 has 16 divisors (see below), whose sum is σ = 81105408. Its totient is φ = 30038400.

The previous prime is 52661603. The next prime is 52661639. The reversal of 52661631 is 13616625.

It is a de Polignac number, because none of the positive numbers 2^k-52661631 is a prime.

It is a super-2 number, since 2×52661631² = 5546494759160322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52661639) 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, 46375 + ... + 47496.

It is an arithmetic number, because the mean of its divisors is an integer number (5069088).

Almost surely, 2^52661631 is an apocalyptic number.

52661631 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

52661631 is a deficient number, since it is larger than the sum of its proper divisors (28443777).

52661631 is a wasteful number, since it uses less digits than its factorization.

52661631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93902.

The product of its digits is 6480, while the sum is 30.

The square root of 52661631 is about 7256.8334003200. The cubic root of 52661631 is about 374.8274904311.

The spelling of 52661631 in words is "fifty-two million, six hundred sixty-one thousand, six hundred thirty-one".