131981920 has 48 divisors (see below), whose sum is σ = 356354208. Its totient is φ = 45250560.

The previous prime is 131981917. The next prime is 131981933. The reversal of 131981920 is 29189131.

It is a congruent number.

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, 57801 + ... + 60040.

It is an arithmetic number, because the mean of its divisors is an integer number (7424046).

Almost surely, 2^131981920 is an apocalyptic number.

131981920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131981920 is an abundant number, since it is smaller than the sum of its proper divisors (224372288).

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

131981920 is a wasteful number, since it uses less digits than its factorization.

131981920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117863 (or 117855 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 131981920 is about 11488.3384351263. The cubic root of 131981920 is about 509.1410892095.

The spelling of 131981920 in words is "one hundred thirty-one million, nine hundred eighty-one thousand, nine hundred twenty".