131308640 has 24 divisors (see below), whose sum is σ = 310217040. Its totient is φ = 52523392.

The previous prime is 131308631. The next prime is 131308643. The reversal of 131308640 is 46803131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131308643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 410180 + ... + 410499.

It is an arithmetic number, because the mean of its divisors is an integer number (12925710).

Almost surely, 2^131308640 is an apocalyptic number.

131308640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131308640 is an abundant number, since it is smaller than the sum of its proper divisors (178908400).

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

131308640 is an equidigital number, since it uses as much as digits as its factorization.

131308640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820694 (or 820686 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 131308640 is about 11458.9982110130. The cubic root of 131308640 is about 508.2738515608.

The spelling of 131308640 in words is "one hundred thirty-one million, three hundred eight thousand, six hundred forty".