181638801 has 8 divisors (see below), whose sum is σ = 269094560. Its totient is φ = 121092516.

The previous prime is 181638773. The next prime is 181638851. The reversal of 181638801 is 108836181.

181638801 is a `hidden beast` number, since 18 + 1 + 638 + 8 + 0 + 1 = 666.

181638801 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-181638801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181638851) 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, 3363655 + ... + 3363708.

It is an arithmetic number, because the mean of its divisors is an integer number (33636820).

Almost surely, 2^181638801 is an apocalyptic number.

It is an amenable number.

181638801 is a deficient number, since it is larger than the sum of its proper divisors (87455759).

181638801 is an equidigital number, since it uses as much as digits as its factorization.

181638801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6727372 (or 6727366 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 181638801 is about 13477.3439890803. The cubic root of 181638801 is about 566.3299663391.

The spelling of 181638801 in words is "one hundred eighty-one million, six hundred thirty-eight thousand, eight hundred one".