131231404 has 12 divisors (see below), whose sum is σ = 241742200. Its totient is φ = 62162208.

The previous prime is 131231393. The next prime is 131231411. The reversal of 131231404 is 404132131.

It is a super-2 number, since 2×131231404² = 34443362791622432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

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, 863289 + ... + 863440.

Almost surely, 2^131231404 is an apocalyptic number.

It is an amenable number.

131231404 is a deficient number, since it is larger than the sum of its proper divisors (110510796).

131231404 is a wasteful number, since it uses less digits than its factorization.

131231404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1726752 (or 1726750 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 131231404 is about 11455.6276126627. The cubic root of 131231404 is about 508.1741761225.

Adding to 131231404 its reverse (404132131), we get a palindrome (535363535).

The spelling of 131231404 in words is "one hundred thirty-one million, two hundred thirty-one thousand, four hundred four".