131781540 has 48 divisors (see below), whose sum is σ = 402534720. Its totient is φ = 31946880.

The previous prime is 131781523. The next prime is 131781553. The reversal of 131781540 is 45187131.

131781540 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 131781498 and 131781507.

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, 99175 + ... + 100494.

It is an arithmetic number, because the mean of its divisors is an integer number (8386140).

Almost surely, 2^131781540 is an apocalyptic number.

131781540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131781540 is an abundant number, since it is smaller than the sum of its proper divisors (270753180).

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

131781540 is a wasteful number, since it uses less digits than its factorization.

131781540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199692 (or 199690 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 131781540 is about 11479.6141050124. The cubic root of 131781540 is about 508.8832928737.

The spelling of 131781540 in words is "one hundred thirty-one million, seven hundred eighty-one thousand, five hundred forty".