131515525 has 12 divisors (see below), whose sum is σ = 166157892. Its totient is φ = 103226240.

The previous prime is 131515513. The next prime is 131515583. The reversal of 131515525 is 525515131.

It can be written as a sum of positive squares in 6 ways, for example, as 4322241 + 127193284 = 2079^2 + 11278^2 .

It is not a de Polignac number, because 131515525 - 2¹¹ = 131513477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131515493 and 131515502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48304 + ... + 50953.

It is an arithmetic number, because the mean of its divisors is an integer number (13846491).

Almost surely, 2^131515525 is an apocalyptic number.

It is an amenable number.

131515525 is a deficient number, since it is larger than the sum of its proper divisors (34642367).

131515525 is an equidigital number, since it uses as much as digits as its factorization.

131515525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99320 (or 99315 counting only the distinct ones).

The product of its digits is 3750, while the sum is 28.

The square root of 131515525 is about 11468.0218433695. The cubic root of 131515525 is about 508.5406506036.

The spelling of 131515525 in words is "one hundred thirty-one million, five hundred fifteen thousand, five hundred twenty-five".