131515555 has 4 divisors (see below), whose sum is σ = 157818672. Its totient is φ = 105212440.

The previous prime is 131515513. The next prime is 131515583. The reversal of 131515555 is 555515131.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 131515555 - 2¹⁵ = 131482787 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13151551 + ... + 13151560.

It is an arithmetic number, because the mean of its divisors is an integer number (39454668).

Almost surely, 2^131515555 is an apocalyptic number.

131515555 is a deficient number, since it is larger than the sum of its proper divisors (26303117).

131515555 is an equidigital number, since it uses as much as digits as its factorization.

131515555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26303116.

The product of its digits is 9375, while the sum is 31.

The square root of 131515555 is about 11468.0231513544. The cubic root of 131515555 is about 508.5406892713.

The spelling of 131515555 in words is "one hundred thirty-one million, five hundred fifteen thousand, five hundred fifty-five".