131971904 has 14 divisors (see below), whose sum is σ = 261881874. Its totient is φ = 65985920.

The previous prime is 131971897. The next prime is 131971913. The reversal of 131971904 is 409179131.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 130873600 + 1098304 = 11440^2 + 1048^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1030967 + ... + 1031094.

Almost surely, 2^131971904 is an apocalyptic number.

It is an amenable number.

131971904 is a deficient number, since it is larger than the sum of its proper divisors (129909970).

131971904 is an equidigital number, since it uses as much as digits as its factorization.

131971904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2062073 (or 2062063 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 131971904 is about 11487.9025065501. The cubic root of 131971904 is about 509.1282094500.

The spelling of 131971904 in words is "one hundred thirty-one million, nine hundred seventy-one thousand, nine hundred four".