999000173 has 2 divisors, whose sum is σ = 999000174. Its totient is φ = 999000172.

The previous prime is 999000157. The next prime is 999000271. The reversal of 999000173 is 371000999.

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., 560600329 + 438399844 = 23677^2 + 20938^2 .

It is an emirp because it is prime and its reverse (371000999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999000173 - 2⁴ = 999000157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999000103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499500086 + 499500087.

It is an arithmetic number, because the mean of its divisors is an integer number (499500087).

Almost surely, 2^999000173 is an apocalyptic number.

It is an amenable number.

999000173 is a deficient number, since it is larger than the sum of its proper divisors (1).

999000173 is an equidigital number, since it uses as much as digits as its factorization.

999000173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 999000173 is about 31606.9639952970. The cubic root of 999000173 is about 999.6666131989. Note that the first 4 decimals are identical.

The spelling of 999000173 in words is "nine hundred ninety-nine million, one hundred seventy-three", and thus it is an aban number.