181339164 has 18 divisors (see below), whose sum is σ = 458385200. Its totient is φ = 60446376.

The previous prime is 181339163. The next prime is 181339201. The reversal of 181339164 is 461933181.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 5037199 = 181339164 / (1 + 8 + 1 + 3 + 3 + 9 + 1 + 6 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181339163) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2518564 + ... + 2518635.

Almost surely, 2^181339164 is an apocalyptic number.

It is an amenable number.

181339164 is an abundant number, since it is smaller than the sum of its proper divisors (277046036).

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

181339164 is a wasteful number, since it uses less digits than its factorization.

181339164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5037209 (or 5037204 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 181339164 is about 13466.2230785027. The cubic root of 181339164 is about 566.0183831177.

It can be divided in two parts, 181339 and 164, that added together give a triangular number (181503 = T₆₀₂).

The spelling of 181339164 in words is "one hundred eighty-one million, three hundred thirty-nine thousand, one hundred sixty-four".