131513515 has 16 divisors (see below), whose sum is σ = 182835648. Its totient is φ = 88943616.

The previous prime is 131513491. The next prime is 131513519. The reversal of 131513515 is 515315131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 131513515 - 2⁵ = 131513483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131513515.

It is not an unprimeable number, because it can be changed into a prime (131513519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23182 + ... + 28291.

It is an arithmetic number, because the mean of its divisors is an integer number (11427228).

Almost surely, 2^131513515 is an apocalyptic number.

131513515 is a deficient number, since it is larger than the sum of its proper divisors (51322133).

131513515 is an equidigital number, since it uses as much as digits as its factorization.

131513515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51558.

The product of its digits is 1125, while the sum is 25.

The square root of 131513515 is about 11467.9342080429. The cubic root of 131513515 is about 508.5380598526.

Adding to 131513515 its reverse (515315131), we get a palindrome (646828646).

The spelling of 131513515 in words is "one hundred thirty-one million, five hundred thirteen thousand, five hundred fifteen".