181836401 has 8 divisors (see below), whose sum is σ = 184200744. Its totient is φ = 179487360.

The previous prime is 181836397. The next prime is 181836419. The reversal of 181836401 is 104638181.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11560000 + 170276401 = 3400^2 + 13049^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 181836401 - 2² = 181836397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181836451) 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, 21131 + ... + 28463.

It is an arithmetic number, because the mean of its divisors is an integer number (23025093).

Almost surely, 2^181836401 is an apocalyptic number.

It is an amenable number.

181836401 is a deficient number, since it is larger than the sum of its proper divisors (2364343).

181836401 is a wasteful number, since it uses less digits than its factorization.

181836401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7651.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 181836401 is about 13484.6728176845. The cubic root of 181836401 is about 566.5352569949.

The spelling of 181836401 in words is "one hundred eighty-one million, eight hundred thirty-six thousand, four hundred one".