131515521 has 8 divisors (see below), whose sum is σ = 175452480. Its totient is φ = 87627792.

The previous prime is 131515513. The next prime is 131515583. The reversal of 131515521 is 125515131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131515521 - 2³ = 131515513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131515491 and 131515500.

It is not an unprimeable number, because it can be changed into a prime (131515591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5541 + ... + 17138.

It is an arithmetic number, because the mean of its divisors is an integer number (21931560).

Almost surely, 2^131515521 is an apocalyptic number.

It is an amenable number.

131515521 is a deficient number, since it is larger than the sum of its proper divisors (43936959).

131515521 is a wasteful number, since it uses less digits than its factorization.

131515521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24615.

The product of its digits is 750, while the sum is 24.

The square root of 131515521 is about 11468.0216689715. The cubic root of 131515521 is about 508.5406454479.

It can be divided in two parts, 1315 and 15521, that added together give a triangular number (16836 = T₁₈₃).

The spelling of 131515521 in words is "one hundred thirty-one million, five hundred fifteen thousand, five hundred twenty-one".