131804865 has 12 divisors (see below), whose sum is σ = 228461844. Its totient is φ = 70295904.

The previous prime is 131804863. The next prime is 131804887. The reversal of 131804865 is 568408131.

It can be written as a sum of positive squares in 2 ways, for example, as 40564161 + 91240704 = 6369^2 + 9552^2 .

It is not a de Polignac number, because 131804865 - 2¹ = 131804863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131804863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1464454 + ... + 1464543.

It is an arithmetic number, because the mean of its divisors is an integer number (19038487).

Almost surely, 2^131804865 is an apocalyptic number.

131804865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131804865 is a deficient number, since it is larger than the sum of its proper divisors (96656979).

131804865 is a wasteful number, since it uses less digits than its factorization.

131804865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2929008 (or 2929005 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 131804865 is about 11480.6299914247. The cubic root of 131804865 is about 508.9133147887.

The spelling of 131804865 in words is "one hundred thirty-one million, eight hundred four thousand, eight hundred sixty-five".