172199609 has 2 divisors, whose sum is σ = 172199610. Its totient is φ = 172199608.

The previous prime is 172199569. The next prime is 172199653. The reversal of 172199609 is 906991271.

172199609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (172199653) can be obtained adding 172199609 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120934009 + 51265600 = 10997^2 + 7160^2 .

It is an emirp because it is prime and its reverse (906991271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172199609 - 2²⁰ = 171151033 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172199609.

It is not a weakly prime, because it can be changed into another prime (172199009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86099804 + 86099805.

It is an arithmetic number, because the mean of its divisors is an integer number (86099805).

Almost surely, 2^172199609 is an apocalyptic number.

It is an amenable number.

172199609 is a deficient number, since it is larger than the sum of its proper divisors (1).

172199609 is an equidigital number, since it uses as much as digits as its factorization.

172199609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 44.

The square root of 172199609 is about 13122.4848637748. The cubic root of 172199609 is about 556.3448262525.

The spelling of 172199609 in words is "one hundred seventy-two million, one hundred ninety-nine thousand, six hundred nine".