181329696 has 36 divisors (see below), whose sum is σ = 515657142. Its totient is φ = 60443136.

The previous prime is 181329689. The next prime is 181329697. The reversal of 181329696 is 696923181.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 143137296 + 38192400 = 11964^2 + 6180^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181329697) 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, 314521 + ... + 315096.

Almost surely, 2^181329696 is an apocalyptic number.

181329696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

181329696 is an abundant number, since it is smaller than the sum of its proper divisors (334327446).

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

181329696 is a wasteful number, since it uses less digits than its factorization.

181329696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629633 (or 629622 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 181329696 is about 13465.8715276806. The cubic root of 181329696 is about 566.0085320460.

The spelling of 181329696 in words is "one hundred eighty-one million, three hundred twenty-nine thousand, six hundred ninety-six".