172259917 has 2 divisors, whose sum is σ = 172259918. Its totient is φ = 172259916.

The previous prime is 172259887. The next prime is 172259933. The reversal of 172259917 is 719952271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150160516 + 22099401 = 12254^2 + 4701^2 .

It is a cyclic number.

It is not a de Polignac number, because 172259917 - 2¹⁵ = 172227149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172259617) 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, 86129958 + 86129959.

It is an arithmetic number, because the mean of its divisors is an integer number (86129959).

Almost surely, 2^172259917 is an apocalyptic number.

It is an amenable number.

172259917 is a deficient number, since it is larger than the sum of its proper divisors (1).

172259917 is an equidigital number, since it uses as much as digits as its factorization.

172259917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79380, while the sum is 43.

The square root of 172259917 is about 13124.7825505796. The cubic root of 172259917 is about 556.4097666394.

The spelling of 172259917 in words is "one hundred seventy-two million, two hundred fifty-nine thousand, nine hundred seventeen".