717160021 has 2 divisors, whose sum is σ = 717160022. Its totient is φ = 717160020.

The previous prime is 717160019. The next prime is 717160039. The reversal of 717160021 is 120061717.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 540562500 + 176597521 = 23250^2 + 13289^2 .

It is an emirp because it is prime and its reverse (120061717) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 717160021 - 2¹ = 717160019 is a prime.

Together with 717160019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (717160061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 358580010 + 358580011.

It is an arithmetic number, because the mean of its divisors is an integer number (358580011).

Almost surely, 2^717160021 is an apocalyptic number.

It is an amenable number.

717160021 is a deficient number, since it is larger than the sum of its proper divisors (1).

717160021 is an equidigital number, since it uses as much as digits as its factorization.

717160021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 717160021 is about 26779.8435581689. The cubic root of 717160021 is about 895.1009617386.

The spelling of 717160021 in words is "seven hundred seventeen million, one hundred sixty thousand, twenty-one".