131520631 has 16 divisors (see below), whose sum is σ = 148608000. Its totient is φ = 115315200.

The previous prime is 131520629. The next prime is 131520637. The reversal of 131520631 is 136025131.

It is a happy number.

It is not a de Polignac number, because 131520631 - 2¹ = 131520629 is a prime.

It is a super-2 number, since 2×131520631² = 34595352757276322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131520637) 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, 152680 + ... + 153538.

It is an arithmetic number, because the mean of its divisors is an integer number (9288000).

Almost surely, 2^131520631 is an apocalyptic number.

131520631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131520631 is a deficient number, since it is larger than the sum of its proper divisors (17087369).

131520631 is a wasteful number, since it uses less digits than its factorization.

131520631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 131520631 is about 11468.2444602476. The cubic root of 131520631 is about 508.5472317657.

Adding to 131520631 its reverse (136025131), we get a palindrome (267545762).

The spelling of 131520631 in words is "one hundred thirty-one million, five hundred twenty thousand, six hundred thirty-one".