181325520 has 160 divisors (see below), whose sum is σ = 630435840. Its totient is φ = 47900160.

The previous prime is 181325513. The next prime is 181325597. The reversal of 181325520 is 25523181.

It is a happy number.

181325520 is a `hidden beast` number, since 1 + 8 + 132 + 5 + 520 = 666.

181325520 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 (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 273990 + ... + 274650.

It is an arithmetic number, because the mean of its divisors is an integer number (3940224).

Almost surely, 2^181325520 is an apocalyptic number.

181325520 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 181325520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315217920).

181325520 is an abundant number, since it is smaller than the sum of its proper divisors (449110320).

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

181325520 is a wasteful number, since it uses less digits than its factorization.

181325520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810 (or 798 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 181325520 is about 13465.7164681275. The cubic root of 181325520 is about 566.0041869776.

The spelling of 181325520 in words is "one hundred eighty-one million, three hundred twenty-five thousand, five hundred twenty".