181490401 has 8 divisors (see below), whose sum is σ = 193786560. Its totient is φ = 169561392.

The previous prime is 181490377. The next prime is 181490437. The reversal of 181490401 is 104094181.

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 181490401 - 2¹³ = 181482209 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 181490401.

It is not an unprimeable number, because it can be changed into a prime (181490501) 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 7 ways as a sum of consecutive naturals, for example, 90766 + ... + 92743.

It is an arithmetic number, because the mean of its divisors is an integer number (24223320).

Almost surely, 2^181490401 is an apocalyptic number.

It is an amenable number.

181490401 is a deficient number, since it is larger than the sum of its proper divisors (12296159).

181490401 is a wasteful number, since it uses less digits than its factorization.

181490401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183575.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 181490401 is about 13471.8373282934. The cubic root of 181490401 is about 566.1756926470.

The spelling of 181490401 in words is "one hundred eighty-one million, four hundred ninety thousand, four hundred one".