181329534 has 12 divisors (see below), whose sum is σ = 392880696. Its totient is φ = 60443172.

The previous prime is 181329529. The next prime is 181329553. The reversal of 181329534 is 435923181.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5036914 + ... + 5036949.

It is an arithmetic number, because the mean of its divisors is an integer number (32740058).

Almost surely, 2^181329534 is an apocalyptic number.

181329534 is an abundant number, since it is smaller than the sum of its proper divisors (211551162).

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

181329534 is a wasteful number, since it uses less digits than its factorization.

181329534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10073871 (or 10073868 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 181329534 is about 13465.8655124726. The cubic root of 181329534 is about 566.0083634886.

The spelling of 181329534 in words is "one hundred eighty-one million, three hundred twenty-nine thousand, five hundred thirty-four".