999170173 has 4 divisors (see below), whose sum is σ = 1008508320. Its totient is φ = 989832028.

The previous prime is 999170167. The next prime is 999170177. The reversal of 999170173 is 371071999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 371071999 = 113 ⋅3283823.

It is a cyclic number.

It is not a de Polignac number, because 999170173 - 2¹⁷ = 999039101 is a prime.

It is a super-2 number, since 2×999170173² = 1996682069225699858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999170177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4668913 + ... + 4669126.

It is an arithmetic number, because the mean of its divisors is an integer number (252127080).

Almost surely, 2^999170173 is an apocalyptic number.

It is an amenable number.

999170173 is a deficient number, since it is larger than the sum of its proper divisors (9338147).

999170173 is a wasteful number, since it uses less digits than its factorization.

999170173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9338146.

The product of its (nonzero) digits is 107163, while the sum is 46.

The square root of 999170173 is about 31609.6531616530. The cubic root of 999170173 is about 999.7233144522.

The spelling of 999170173 in words is "nine hundred ninety-nine million, one hundred seventy thousand, one hundred seventy-three".