131312100520 has 32 divisors (see below), whose sum is σ = 295470729000. Its totient is φ = 52521550848.

The previous prime is 131312100509. The next prime is 131312100539. The reversal of 131312100520 is 25001213131.

It can be written as a sum of positive squares in 4 ways, for example, as 128905413156 + 2406687364 = 359034^2 + 49058^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 603892 + ... + 792028.

Almost surely, 2^131312100520 is an apocalyptic number.

131312100520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131312100520 is an abundant number, since it is smaller than the sum of its proper divisors (164158628480).

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

131312100520 is a wasteful number, since it uses less digits than its factorization.

131312100520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205597 (or 205593 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

Adding to 131312100520 its reverse (25001213131), we get a palindrome (156313313651).

The spelling of 131312100520 in words is "one hundred thirty-one billion, three hundred twelve million, one hundred thousand, five hundred twenty".