115181520 has 80 divisors (see below), whose sum is σ = 365399232. Its totient is φ = 29998080.

The previous prime is 115181519. The next prime is 115181527. The reversal of 115181520 is 25181511.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115181527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4740 + ... + 15900.

Almost surely, 2^115181520 is an apocalyptic number.

115181520 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 115181520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182699616).

115181520 is an abundant number, since it is smaller than the sum of its proper divisors (250217712).

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

115181520 is a wasteful number, since it uses less digits than its factorization.

115181520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11220 (or 11214 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 24.

The square root of 115181520 is about 10732.2653712998. The cubic root of 115181520 is about 486.5501399460.

Subtracting from 115181520 its reverse (25181511), we obtain a palindrome (90000009).

The spelling of 115181520 in words is "one hundred fifteen million, one hundred eighty-one thousand, five hundred twenty".