181634401 has 16 divisors (see below), whose sum is σ = 199317888. Its totient is φ = 164505600.

The previous prime is 181634353. The next prime is 181634417. The reversal of 181634401 is 104436181.

It is a cyclic number.

It is not a de Polignac number, because 181634401 - 2⁹ = 181633889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 181634401.

It is not an unprimeable number, because it can be changed into a prime (181634491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283041 + ... + 283681.

It is an arithmetic number, because the mean of its divisors is an integer number (12457368).

Almost surely, 2^181634401 is an apocalyptic number.

It is an amenable number.

181634401 is a deficient number, since it is larger than the sum of its proper divisors (17683487).

181634401 is a wasteful number, since it uses less digits than its factorization.

181634401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 181634401 is about 13477.1807511809. The cubic root of 181634401 is about 566.3253933955.

The spelling of 181634401 in words is "one hundred eighty-one million, six hundred thirty-four thousand, four hundred one".