131439815 has 32 divisors (see below), whose sum is σ = 181440000. Its totient is φ = 90599040.

The previous prime is 131439797. The next prime is 131439829. The reversal of 131439815 is 518934131.

It is not a de Polignac number, because 131439815 - 2⁶ = 131439751 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86936 + ... + 88434.

It is an arithmetic number, because the mean of its divisors is an integer number (5670000).

Almost surely, 2^131439815 is an apocalyptic number.

131439815 is a deficient number, since it is larger than the sum of its proper divisors (50000185).

131439815 is a wasteful number, since it uses less digits than its factorization.

131439815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1607.

The product of its digits is 12960, while the sum is 35.

The square root of 131439815 is about 11464.7204501462. The cubic root of 131439815 is about 508.4430474166.

The spelling of 131439815 in words is "one hundred thirty-one million, four hundred thirty-nine thousand, eight hundred fifteen".