2118173 has 2 divisors, whose sum is σ = 2118174. Its totient is φ = 2118172.

The previous prime is 2118169. The next prime is 2118187. The reversal of 2118173 is 3718112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2079364 + 38809 = 1442^2 + 197^2 .

It is a cyclic number.

It is not a de Polignac number, because 2118173 - 2² = 2118169 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2118113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1059086 + 1059087.

It is an arithmetic number, because the mean of its divisors is an integer number (1059087).

2^2118173 is an apocalyptic number.

It is an amenable number.

2118173 is a deficient number, since it is larger than the sum of its proper divisors (1).

2118173 is an equidigital number, since it uses as much as digits as its factorization.

2118173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 23.

The square root of 2118173 is about 1455.3944482511. The cubic root of 2118173 is about 128.4262523031.

The spelling of 2118173 in words is "two million, one hundred eighteen thousand, one hundred seventy-three".