172647317 has 2 divisors, whose sum is σ = 172647318. Its totient is φ = 172647316.

The previous prime is 172647301. The next prime is 172647329. The reversal of 172647317 is 713746271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172370641 + 276676 = 13129^2 + 526^2 .

It is a cyclic number.

It is not a de Polignac number, because 172647317 - 2⁴ = 172647301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172647337) 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, 86323658 + 86323659.

It is an arithmetic number, because the mean of its divisors is an integer number (86323659).

Almost surely, 2^172647317 is an apocalyptic number.

It is an amenable number.

172647317 is a deficient number, since it is larger than the sum of its proper divisors (1).

172647317 is an equidigital number, since it uses as much as digits as its factorization.

172647317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392, while the sum is 38.

The square root of 172647317 is about 13139.5326020373. The cubic root of 172647317 is about 556.8265626864.

The spelling of 172647317 in words is "one hundred seventy-two million, six hundred forty-seven thousand, three hundred seventeen".