172099 has 4 divisors (see below), whose sum is σ = 173736. Its totient is φ = 170464.

The previous prime is 172097. The next prime is 172127. The reversal of 172099 is 990271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 990271 = 433 ⋅2287.

It is a cyclic number.

It is not a de Polignac number, because 172099 - 2¹ = 172097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172093) 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, 649 + ... + 874.

It is an arithmetic number, because the mean of its divisors is an integer number (43434).

2¹⁷²⁰⁹⁹ is an apocalyptic number.

172099 is a deficient number, since it is larger than the sum of its proper divisors (1637).

172099 is a wasteful number, since it uses less digits than its factorization.

172099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 172099 is about 414.8481649953. The cubic root of 172099 is about 55.6236455505.

It can be divided in two parts, 17 and 2099, that added together give a square (2116 = 46²).

The spelling of 172099 in words is "one hundred seventy-two thousand, ninety-nine".