171680917 has 2 divisors, whose sum is σ = 171680918. Its totient is φ = 171680916.

The previous prime is 171680893. The next prime is 171680921. The reversal of 171680917 is 719086171.

171680917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132917841 + 38763076 = 11529^2 + 6226^2 .

It is an emirp because it is prime and its reverse (719086171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171680917 - 2²³ = 163292309 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 171680917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171680017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85840458 + 85840459.

It is an arithmetic number, because the mean of its divisors is an integer number (85840459).

Almost surely, 2^171680917 is an apocalyptic number.

It is an amenable number.

171680917 is a deficient number, since it is larger than the sum of its proper divisors (1).

171680917 is an equidigital number, since it uses as much as digits as its factorization.

171680917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 40.

The square root of 171680917 is about 13102.7064761445. The cubic root of 171680917 is about 555.7856654062.

The spelling of 171680917 in words is "one hundred seventy-one million, six hundred eighty thousand, nine hundred seventeen".