18550161 has 32 divisors (see below), whose sum is σ = 31942400. Its totient is φ = 10419840.

The previous prime is 18550151. The next prime is 18550171. The reversal of 18550161 is 16105581.

It is an interprime number because it is at equal distance from previous prime (18550151) and next prime (18550171).

It is not a de Polignac number, because 18550161 - 2⁶ = 18550097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (18550151) 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 31 ways as a sum of consecutive naturals, for example, 10725 + ... + 12333.

It is an arithmetic number, because the mean of its divisors is an integer number (998200).

Almost surely, 2^18550161 is an apocalyptic number.

It is an amenable number.

18550161 is a deficient number, since it is larger than the sum of its proper divisors (13392239).

18550161 is a wasteful number, since it uses less digits than its factorization.

18550161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1686 (or 1680 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The square root of 18550161 is about 4306.9897840603. The cubic root of 18550161 is about 264.7174441747.

The spelling of 18550161 in words is "eighteen million, five hundred fifty thousand, one hundred sixty-one".