181117252 has 48 divisors (see below), whose sum is σ = 349332480. Its totient is φ = 81792000.

The previous prime is 181117243. The next prime is 181117289. The reversal of 181117252 is 252711181.

It is a self number, because there is not a number n which added to its sum of digits gives 181117252.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 318024 + ... + 318592.

It is an arithmetic number, because the mean of its divisors is an integer number (7277760).

Almost surely, 2^181117252 is an apocalyptic number.

It is an amenable number.

181117252 is a deficient number, since it is larger than the sum of its proper divisors (168215228).

181117252 is a wasteful number, since it uses less digits than its factorization.

181117252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772 (or 770 counting only the distinct ones).

The product of its digits is 1120, while the sum is 28.

The square root of 181117252 is about 13457.9809778436. The cubic root of 181117252 is about 565.7874024147.

The spelling of 181117252 in words is "one hundred eighty-one million, one hundred seventeen thousand, two hundred fifty-two".