131515530 has 32 divisors (see below), whose sum is σ = 332251200. Its totient is φ = 33224832.

The previous prime is 131515513. The next prime is 131515583. The reversal of 131515530 is 35515131.

It is a self number, because there is not a number n which added to its sum of digits gives 131515530.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114795 + ... + 115934.

It is an arithmetic number, because the mean of its divisors is an integer number (10382850).

Almost surely, 2^131515530 is an apocalyptic number.

131515530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131515530 is an abundant number, since it is smaller than the sum of its proper divisors (200735670).

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

131515530 is a wasteful number, since it uses less digits than its factorization.

131515530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230758.

The product of its (nonzero) digits is 1125, while the sum is 24.

The square root of 131515530 is about 11468.0220613670. The cubic root of 131515530 is about 508.5406570482.

It can be divided in two parts, 13151 and 5530, that added together give a palindrome (18681).

The spelling of 131515530 in words is "one hundred thirty-one million, five hundred fifteen thousand, five hundred thirty".