181252920 has 48 divisors (see below), whose sum is σ = 544201560. Its totient is φ = 48294784.

The previous prime is 181252919. The next prime is 181252921. The reversal of 181252920 is 29252181.

It is an interprime number because it is at equal distance from previous prime (181252919) and next prime (181252921).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181252921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146866 + ... + 148094.

Almost surely, 2^181252920 is an apocalyptic number.

181252920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181252920 is an abundant number, since it is smaller than the sum of its proper divisors (362948640).

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

181252920 is an equidigital number, since it uses as much as digits as its factorization.

181252920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2472 (or 1239 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 181252920 is about 13463.0204634770. The cubic root of 181252920 is about 565.9286370507.

Multiplying 181252920 by its sum of digits (30), we get a square (5437587600 = 73740²).

181252920 divided by its sum of digits (30) gives a square (6041764 = 2458²).

The spelling of 181252920 in words is "one hundred eighty-one million, two hundred fifty-two thousand, nine hundred twenty".