172222109 has 2 divisors, whose sum is σ = 172222110. Its totient is φ = 172222108.

The previous prime is 172222027. The next prime is 172222117. The reversal of 172222109 is 901222271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165199609 + 7022500 = 12853^2 + 2650^2 .

It is a cyclic number.

It is not a de Polignac number, because 172222109 - 2²⁰ = 171173533 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 (172222409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86111054 + 86111055.

It is an arithmetic number, because the mean of its divisors is an integer number (86111055).

Almost surely, 2^172222109 is an apocalyptic number.

It is an amenable number.

172222109 is a deficient number, since it is larger than the sum of its proper divisors (1).

172222109 is an equidigital number, since it uses as much as digits as its factorization.

172222109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 172222109 is about 13123.3421429147. The cubic root of 172222109 is about 556.3690562987.

The spelling of 172222109 in words is "one hundred seventy-two million, two hundred twenty-two thousand, one hundred nine".