131231304 has 48 divisors (see below), whose sum is σ = 365031420. Its totient is φ = 42560640.

The previous prime is 131231299. The next prime is 131231323. The reversal of 131231304 is 403132131.

131231304 is a `hidden beast` number, since 131 + 231 + 304 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 129276900 + 1954404 = 11370^2 + 1398^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21967 + ... + 27294.

Almost surely, 2^131231304 is an apocalyptic number.

It is an amenable number.

131231304 is an abundant number, since it is smaller than the sum of its proper divisors (233800116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131231304 is a wasteful number, since it uses less digits than its factorization.

131231304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49310 (or 49303 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 131231304 is about 11455.6232479948. The cubic root of 131231304 is about 508.1740470441.

Adding to 131231304 its reverse (403132131), we get a palindrome (534363435).

The spelling of 131231304 in words is "one hundred thirty-one million, two hundred thirty-one thousand, three hundred four".