131165540 has 72 divisors (see below), whose sum is σ = 319358592. Its totient is φ = 44869120.

The previous prime is 131165539. The next prime is 131165549. The reversal of 131165540 is 45561131.

It is not an unprimeable number, because it can be changed into a prime (131165549) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62549 + ... + 64611.

It is an arithmetic number, because the mean of its divisors is an integer number (4435536).

Almost surely, 2^131165540 is an apocalyptic number.

131165540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131165540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159679296).

131165540 is an abundant number, since it is smaller than the sum of its proper divisors (188193052).

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

131165540 is a wasteful number, since it uses less digits than its factorization.

131165540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2117 (or 2098 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 131165540 is about 11452.7525075852. The cubic root of 131165540 is about 508.0891457005.

The spelling of 131165540 in words is "one hundred thirty-one million, one hundred sixty-five thousand, five hundred forty".