131539640 has 32 divisors (see below), whose sum is σ = 301553280. Its totient is φ = 51622272.

The previous prime is 131539633. The next prime is 131539643. The reversal of 131539640 is 46935131.

It is a junction number, because it is equal to n+sod(n) for n = 131539597 and 131539606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131539643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28904 + ... + 33143.

It is an arithmetic number, because the mean of its divisors is an integer number (9423540).

Almost surely, 2^131539640 is an apocalyptic number.

131539640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131539640 is an abundant number, since it is smaller than the sum of its proper divisors (170013640).

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

131539640 is a wasteful number, since it uses less digits than its factorization.

131539640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62111 (or 62107 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 131539640 is about 11469.0731970809. The cubic root of 131539640 is about 508.5717311124.

The spelling of 131539640 in words is "one hundred thirty-one million, five hundred thirty-nine thousand, six hundred forty".