115531540 has 24 divisors (see below), whose sum is σ = 248260320. Its totient is φ = 45137568.

The previous prime is 115531511. The next prime is 115531543. The reversal of 115531540 is 45135511.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115531543) 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, 66310 + ... + 68029.

It is an arithmetic number, because the mean of its divisors is an integer number (10344180).

Almost surely, 2^115531540 is an apocalyptic number.

115531540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115531540 is an abundant number, since it is smaller than the sum of its proper divisors (132728780).

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

115531540 is a wasteful number, since it uses less digits than its factorization.

115531540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134391 (or 134389 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 115531540 is about 10748.5599035406. The cubic root of 115531540 is about 487.0424934144.

The spelling of 115531540 in words is "one hundred fifteen million, five hundred thirty-one thousand, five hundred forty".