172016917 has 2 divisors, whose sum is σ = 172016918. Its totient is φ = 172016916.

The previous prime is 172016903. The next prime is 172016921. The reversal of 172016917 is 719610271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132503121 + 39513796 = 11511^2 + 6286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172016917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172016947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86008458 + 86008459.

It is an arithmetic number, because the mean of its divisors is an integer number (86008459).

Almost surely, 2^172016917 is an apocalyptic number.

It is an amenable number.

172016917 is a deficient number, since it is larger than the sum of its proper divisors (1).

172016917 is an equidigital number, since it uses as much as digits as its factorization.

172016917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 34.

The square root of 172016917 is about 13115.5219873248. The cubic root of 172016917 is about 556.1480087045.

The spelling of 172016917 in words is "one hundred seventy-two million, sixteen thousand, nine hundred seventeen".