181371812 has 6 divisors (see below), whose sum is σ = 317400678. Its totient is φ = 90685904.

The previous prime is 181371811. The next prime is 181371821. The reversal of 181371812 is 218173181.

181371812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 115047076 + 66324736 = 10726^2 + 8144^2 .

It is not an unprimeable number, because it can be changed into a prime (181371811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22671473 + ... + 22671480.

It is an arithmetic number, because the mean of its divisors is an integer number (52900113).

Almost surely, 2^181371812 is an apocalyptic number.

It is an amenable number.

181371812 is a deficient number, since it is larger than the sum of its proper divisors (136028866).

181371812 is a wasteful number, since it uses less digits than its factorization.

181371812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45342957 (or 45342955 counting only the distinct ones).

The product of its digits is 2688, while the sum is 32.

The square root of 181371812 is about 13467.4352420942. The cubic root of 181371812 is about 566.0523494139.

The spelling of 181371812 in words is "one hundred eighty-one million, three hundred seventy-one thousand, eight hundred twelve".