636224131 has 4 divisors (see below), whose sum is σ = 640276672. Its totient is φ = 632171592.

The previous prime is 636224123. The next prime is 636224143. The reversal of 636224131 is 131422636.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 636224131 - 2³ = 636224123 is a prime.

It is a super-2 number, since 2×636224131² = 809562289733410322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 636224131.

It is not an unprimeable number, because it can be changed into a prime (636225131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2026035 + ... + 2026348.

It is an arithmetic number, because the mean of its divisors is an integer number (160069168).

Almost surely, 2^636224131 is an apocalyptic number.

636224131 is a deficient number, since it is larger than the sum of its proper divisors (4052541).

636224131 is a wasteful number, since it uses less digits than its factorization.

636224131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4052540.

The product of its digits is 5184, while the sum is 28.

The square root of 636224131 is about 25223.4837205331. The cubic root of 636224131 is about 860.0757689688.

Adding to 636224131 its reverse (131422636), we get a palindrome (767646767).

The spelling of 636224131 in words is "six hundred thirty-six million, two hundred twenty-four thousand, one hundred thirty-one".