18319161 has 16 divisors (see below), whose sum is σ = 28565504. Its totient is φ = 10224144.

The previous prime is 18319153. The next prime is 18319163. The reversal of 18319161 is 16191381.

It is not a de Polignac number, because 18319161 - 2³ = 18319153 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18319163) 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, 9241 + ... + 11046.

It is an arithmetic number, because the mean of its divisors is an integer number (1785344).

Almost surely, 2^18319161 is an apocalyptic number.

It is an amenable number.

18319161 is a deficient number, since it is larger than the sum of its proper divisors (10246343).

18319161 is a wasteful number, since it uses less digits than its factorization.

18319161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20340.

The product of its digits is 1296, while the sum is 30.

The square root of 18319161 is about 4280.0889009459. The cubic root of 18319161 is about 263.6140336760.

The spelling of 18319161 in words is "eighteen million, three hundred nineteen thousand, one hundred sixty-one".