131521836 has 24 divisors (see below), whose sum is σ = 308496384. Its totient is φ = 43610320.

The previous prime is 131521823. The next prime is 131521903. The reversal of 131521836 is 638125131.

It is a plaindrome in base 14.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26400 + ... + 30983.

It is an arithmetic number, because the mean of its divisors is an integer number (12854016).

Almost surely, 2^131521836 is an apocalyptic number.

It is an amenable number.

131521836 is an abundant number, since it is smaller than the sum of its proper divisors (176974548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131521836 is a wasteful number, since it uses less digits than its factorization.

131521836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57581 (or 57579 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 131521836 is about 11468.2969965030. The cubic root of 131521836 is about 508.5487848744.

Adding to 131521836 its reverse (638125131), we get a palindrome (769646967).

The spelling of 131521836 in words is "one hundred thirty-one million, five hundred twenty-one thousand, eight hundred thirty-six".