131081440 has 48 divisors (see below), whose sum is σ = 353922912. Its totient is φ = 44941824.

The previous prime is 131081389. The next prime is 131081471. The reversal of 131081440 is 44180131.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57399 + ... + 59638.

It is an arithmetic number, because the mean of its divisors is an integer number (7373394).

Almost surely, 2^131081440 is an apocalyptic number.

131081440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131081440 is an abundant number, since it is smaller than the sum of its proper divisors (222841472).

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

131081440 is a wasteful number, since it uses less digits than its factorization.

131081440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117059 (or 117051 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 131081440 is about 11449.0803124094. The cubic root of 131081440 is about 507.9805312149.

The spelling of 131081440 in words is "one hundred thirty-one million, eighty-one thousand, four hundred forty".