172765217 has 2 divisors, whose sum is σ = 172765218. Its totient is φ = 172765216.

The previous prime is 172765211. The next prime is 172765261. The reversal of 172765217 is 712567271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166693921 + 6071296 = 12911^2 + 2464^2 .

It is a cyclic number.

It is not a de Polignac number, because 172765217 - 2⁸ = 172764961 is a prime.

It is not a weakly prime, because it can be changed into another prime (172765211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86382608 + 86382609.

It is an arithmetic number, because the mean of its divisors is an integer number (86382609).

Almost surely, 2^172765217 is an apocalyptic number.

It is an amenable number.

172765217 is a deficient number, since it is larger than the sum of its proper divisors (1).

172765217 is an equidigital number, since it uses as much as digits as its factorization.

172765217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41160, while the sum is 38.

The square root of 172765217 is about 13144.0182973092. The cubic root of 172765217 is about 556.9532852145.

The spelling of 172765217 in words is "one hundred seventy-two million, seven hundred sixty-five thousand, two hundred seventeen".