172199309 has 2 divisors, whose sum is σ = 172199310. Its totient is φ = 172199308.

The previous prime is 172199267. The next prime is 172199333. The reversal of 172199309 is 903991271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166978084 + 5221225 = 12922^2 + 2285^2 .

It is a cyclic number.

It is not a de Polignac number, because 172199309 - 2²⁴ = 155422093 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172199359) 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 as a sum of consecutive naturals, namely, 86099654 + 86099655.

It is an arithmetic number, because the mean of its divisors is an integer number (86099655).

Almost surely, 2^172199309 is an apocalyptic number.

It is an amenable number.

172199309 is a deficient number, since it is larger than the sum of its proper divisors (1).

172199309 is an equidigital number, since it uses as much as digits as its factorization.

172199309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 172199309 is about 13122.4734330080. The cubic root of 172199309 is about 556.3445031710.

The spelling of 172199309 in words is "one hundred seventy-two million, one hundred ninety-nine thousand, three hundred nine".