2158173 has 12 divisors (see below), whose sum is σ = 3202108. Its totient is φ = 1399680.

The previous prime is 2158171. The next prime is 2158181. The reversal of 2158173 is 3718512.

It can be written as a sum of positive squares in 2 ways, for example, as 1996569 + 161604 = 1413^2 + 402^2 .

It is not a de Polignac number, because 2158173 - 2¹ = 2158171 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2908 + ... + 3573.

2^2158173 is an apocalyptic number.

It is an amenable number.

2158173 is a deficient number, since it is larger than the sum of its proper divisors (1043935).

2158173 is a wasteful number, since it uses less digits than its factorization.

2158173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6524 (or 6521 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 2158173 is about 1469.0721561584. The cubic root of 2158173 is about 129.2296252679.

The spelling of 2158173 in words is "two million, one hundred fifty-eight thousand, one hundred seventy-three".