131505915 has 8 divisors (see below), whose sum is σ = 210409488. Its totient is φ = 70136480.

The previous prime is 131505887. The next prime is 131505919. The reversal of 131505915 is 519505131.

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

It is not a de Polignac number, because 131505915 - 2⁵ = 131505883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131505919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4383516 + ... + 4383545.

It is an arithmetic number, because the mean of its divisors is an integer number (26301186).

Almost surely, 2^131505915 is an apocalyptic number.

131505915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

131505915 is a deficient number, since it is larger than the sum of its proper divisors (78903573).

131505915 is an equidigital number, since it uses as much as digits as its factorization.

131505915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8767069.

The product of its (nonzero) digits is 3375, while the sum is 30.

The square root of 131505915 is about 11467.6028445356. The cubic root of 131505915 is about 508.5282637398.

The spelling of 131505915 in words is "one hundred thirty-one million, five hundred five thousand, nine hundred fifteen".