18031161 has 8 divisors (see below), whose sum is σ = 24112224. Its totient is φ = 11985440.

The previous prime is 18031151. The next prime is 18031163. The reversal of 18031161 is 16113081.

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 18031161 - 2⁵ = 18031129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18031163) 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, 7620 + ... + 9701.

It is an arithmetic number, because the mean of its divisors is an integer number (3014028).

Almost surely, 2^18031161 is an apocalyptic number.

It is an amenable number.

18031161 is a deficient number, since it is larger than the sum of its proper divisors (6081063).

18031161 is a wasteful number, since it uses less digits than its factorization.

18031161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17671.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 18031161 is about 4246.3114581952. The cubic root of 18031161 is about 262.2252835740.

The spelling of 18031161 in words is "eighteen million, thirty-one thousand, one hundred sixty-one".