18080161 has 16 divisors (see below), whose sum is σ = 20924928. Its totient is φ = 15465600.

The previous prime is 18080149. The next prime is 18080203. The reversal of 18080161 is 16108081.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18080161 - 2⁷ = 18080033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18080131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11901 + ... + 13333.

It is an arithmetic number, because the mean of its divisors is an integer number (1307808).

Almost surely, 2^18080161 is an apocalyptic number.

18080161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18080161 is a deficient number, since it is larger than the sum of its proper divisors (2844767).

18080161 is a wasteful number, since it uses less digits than its factorization.

18080161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 18080161 is about 4252.0772570592. The cubic root of 18080161 is about 262.4626026845.

The spelling of 18080161 in words is "eighteen million, eighty thousand, one hundred sixty-one".