172005199 has 4 divisors (see below), whose sum is σ = 174182560. Its totient is φ = 169827840.

The previous prime is 172005181. The next prime is 172005221. The reversal of 172005199 is 991500271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172005199 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 (172005149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1088562 + ... + 1088719.

It is an arithmetic number, because the mean of its divisors is an integer number (43545640).

Almost surely, 2^172005199 is an apocalyptic number.

172005199 is a deficient number, since it is larger than the sum of its proper divisors (2177361).

172005199 is an equidigital number, since it uses as much as digits as its factorization.

172005199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2177360.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 172005199 is about 13115.0752571230. The cubic root of 172005199 is about 556.1353799265.

The spelling of 172005199 in words is "one hundred seventy-two million, five thousand, one hundred ninety-nine".