131998636 has 24 divisors (see below), whose sum is σ = 287997696. Its totient is φ = 51427920.

The previous prime is 131998627. The next prime is 131998649. The reversal of 131998636 is 636899131.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213976 + ... + 214591.

It is an arithmetic number, because the mean of its divisors is an integer number (11999904).

Almost surely, 2^131998636 is an apocalyptic number.

It is an amenable number.

131998636 is an abundant number, since it is smaller than the sum of its proper divisors (155999060).

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

131998636 is a wasteful number, since it uses less digits than its factorization.

131998636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428589 (or 428587 counting only the distinct ones).

The product of its digits is 209952, while the sum is 46.

The square root of 131998636 is about 11489.0659324420. The cubic root of 131998636 is about 509.1625831716.

The spelling of 131998636 in words is "one hundred thirty-one million, nine hundred ninety-eight thousand, six hundred thirty-six".