131309540 has 48 divisors (see below), whose sum is σ = 283675392. Its totient is φ = 51031296.

The previous prime is 131309537. The next prime is 131309557. The reversal of 131309540 is 45903131.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152792 + ... + 153648.

It is an arithmetic number, because the mean of its divisors is an integer number (5909904).

Almost surely, 2^131309540 is an apocalyptic number.

131309540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131309540 is an abundant number, since it is smaller than the sum of its proper divisors (152365852).

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

131309540 is a wasteful number, since it uses less digits than its factorization.

131309540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076 (or 1074 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 131309540 is about 11459.0374813943. The cubic root of 131309540 is about 508.2750128081.

The spelling of 131309540 in words is "one hundred thirty-one million, three hundred nine thousand, five hundred forty".