181542164 has 12 divisors (see below), whose sum is σ = 317809044. Its totient is φ = 90739584.

The previous prime is 181542149. The next prime is 181542181. The reversal of 181542164 is 461245181.

It can be written as a sum of positive squares in 2 ways, for example, as 72965764 + 108576400 = 8542^2 + 10420^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 181542164.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9212 + ... + 21164.

It is an arithmetic number, because the mean of its divisors is an integer number (26484087).

Almost surely, 2^181542164 is an apocalyptic number.

It is an amenable number.

181542164 is a deficient number, since it is larger than the sum of its proper divisors (136266880).

181542164 is a wasteful number, since it uses less digits than its factorization.

181542164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15754 (or 15752 counting only the distinct ones).

The product of its digits is 7680, while the sum is 32.

The square root of 181542164 is about 13473.7583472467. The cubic root of 181542164 is about 566.2295139812.

The spelling of 181542164 in words is "one hundred eighty-one million, five hundred forty-two thousand, one hundred sixty-four".