131991708 has 36 divisors (see below), whose sum is σ = 325053960. Its totient is φ = 41680224.

The previous prime is 131991701. The next prime is 131991709. The reversal of 131991708 is 807199131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131991701) 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, 10903 + ... + 19566.

Almost surely, 2^131991708 is an apocalyptic number.

It is an amenable number.

131991708 is an abundant number, since it is smaller than the sum of its proper divisors (193062252).

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

131991708 is a wasteful number, since it uses less digits than its factorization.

131991708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30514 (or 30493 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 39.

The square root of 131991708 is about 11488.7644244279. The cubic root of 131991708 is about 509.1536751501.

The spelling of 131991708 in words is "one hundred thirty-one million, nine hundred ninety-one thousand, seven hundred eight".