18122173 has 2 divisors, whose sum is σ = 18122174. Its totient is φ = 18122172.

The previous prime is 18122161. The next prime is 18122179. The reversal of 18122173 is 37122181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10067929 + 8054244 = 3173^2 + 2838^2 .

It is a cyclic number.

It is not a de Polignac number, because 18122173 - 2⁵ = 18122141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18122179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9061086 + 9061087.

It is an arithmetic number, because the mean of its divisors is an integer number (9061087).

Almost surely, 2^18122173 is an apocalyptic number.

It is an amenable number.

18122173 is a deficient number, since it is larger than the sum of its proper divisors (1).

18122173 is an equidigital number, since it uses as much as digits as its factorization.

18122173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 25.

The square root of 18122173 is about 4257.0145642222. The cubic root of 18122173 is about 262.6657360015.

The spelling of 18122173 in words is "eighteen million, one hundred twenty-two thousand, one hundred seventy-three".