2170856717 has 2 divisors, whose sum is σ = 2170856718. Its totient is φ = 2170856716.

The previous prime is 2170856687. The next prime is 2170856719. The reversal of 2170856717 is 7176580712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1364637481 + 806219236 = 36941^2 + 28394^2 .

It is a cyclic number.

It is not a de Polignac number, because 2170856717 - 2⁸ = 2170856461 is a prime.

Together with 2170856719, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2170856719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085428358 + 1085428359.

It is an arithmetic number, because the mean of its divisors is an integer number (1085428359).

Almost surely, 2^2170856717 is an apocalyptic number.

It is an amenable number.

2170856717 is a deficient number, since it is larger than the sum of its proper divisors (1).

2170856717 is an equidigital number, since it uses as much as digits as its factorization.

2170856717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 164640, while the sum is 44.

The square root of 2170856717 is about 46592.4534340058. The cubic root of 2170856717 is about 1294.8229444435.

The spelling of 2170856717 in words is "two billion, one hundred seventy million, eight hundred fifty-six thousand, seven hundred seventeen".