181130164 has 24 divisors (see below), whose sum is σ = 320200160. Its totient is φ = 89649504.

The previous prime is 181130161. The next prime is 181130197. The reversal of 181130164 is 461031181.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181130161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246742 + ... + 247474.

Almost surely, 2^181130164 is an apocalyptic number.

It is an amenable number.

181130164 is a deficient number, since it is larger than the sum of its proper divisors (139069996).

181130164 is a wasteful number, since it uses less digits than its factorization.

181130164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279 (or 1277 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 181130164 is about 13458.4606846400. The cubic root of 181130164 is about 565.8008472472.

The spelling of 181130164 in words is "one hundred eighty-one million, one hundred thirty thousand, one hundred sixty-four".