636131 has 4 divisors (see below), whose sum is σ = 638064. Its totient is φ = 634200.

The previous prime is 636109. The next prime is 636133. The reversal of 636131 is 131636.

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 636131 - 2¹⁸ = 373987 is a prime.

It is a super-2 number, since 2×636131² = 809325298322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (636133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335 + ... + 1176.

It is an arithmetic number, because the mean of its divisors is an integer number (159516).

2⁶³⁶¹³¹ is an apocalyptic number.

636131 is a deficient number, since it is larger than the sum of its proper divisors (1933).

636131 is a wasteful number, since it uses less digits than its factorization.

636131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932.

The product of its digits is 324, while the sum is 20.

The square root of 636131 is about 797.5782093312. The cubic root of 636131 is about 86.0033800727.

Adding to 636131 its reverse (131636), we get a palindrome (767767).

It can be divided in two parts, 636 and 131, that added together give a palindrome (767).

The spelling of 636131 in words is "six hundred thirty-six thousand, one hundred thirty-one".