181899168 has 96 divisors (see below), whose sum is σ = 523599552. Its totient is φ = 54835200.

The previous prime is 181899161. The next prime is 181899181. The reversal of 181899168 is 861998181.

It is a Cunningham number, because it is equal to 13487²-1.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 181899168.

It is not an unprimeable number, because it can be changed into a prime (181899161) 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, 296430 + ... + 297042.

It is an arithmetic number, because the mean of its divisors is an integer number (5454162).

Almost surely, 2^181899168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181899168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261799776).

181899168 is an abundant number, since it is smaller than the sum of its proper divisors (341700384).

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

181899168 is a wasteful number, since it uses less digits than its factorization.

181899168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918 (or 910 counting only the distinct ones).

The product of its digits is 248832, while the sum is 51.

The square root of 181899168 is about 13486.9999629273. Note that the first 4 decimals coincide. The cubic root of 181899168 is about 566.6004357811.

The spelling of 181899168 in words is "one hundred eighty-one million, eight hundred ninety-nine thousand, one hundred sixty-eight".