172999 has 2 divisors, whose sum is σ = 173000. Its totient is φ = 172998.

The previous prime is 172993. The next prime is 173021. The reversal of 172999 is 999271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172999 - 2⁷ = 172871 is a prime.

It is a Chen prime.

172999 is a modest number, since divided by 999 gives 172 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86499 + 86500.

It is an arithmetic number, because the mean of its divisors is an integer number (86500).

2¹⁷²⁹⁹⁹ is an apocalyptic number.

172999 is a deficient number, since it is larger than the sum of its proper divisors (1).

172999 is an equidigital number, since it uses as much as digits as its factorization.

172999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 37.

The square root of 172999 is about 415.9314847424. The cubic root of 172999 is about 55.7204391939.

It can be divided in two parts, 1729 and 99, that multiplied together give a palindrome (171171).

The spelling of 172999 in words is "one hundred seventy-two thousand, nine hundred ninety-nine".