717385993 has 2 divisors, whose sum is σ = 717385994. Its totient is φ = 717385992.

The previous prime is 717385969. The next prime is 717386023. The reversal of 717385993 is 399583717.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 493195264 + 224190729 = 22208^2 + 14973^2 .

It is a cyclic number.

It is not a de Polignac number, because 717385993 - 2²¹ = 715288841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 717385993.

It is not a weakly prime, because it can be changed into another prime (717385913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 358692996 + 358692997.

It is an arithmetic number, because the mean of its divisors is an integer number (358692997).

Almost surely, 2^717385993 is an apocalyptic number.

It is an amenable number.

717385993 is a deficient number, since it is larger than the sum of its proper divisors (1).

717385993 is an equidigital number, since it uses as much as digits as its factorization.

717385993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1428840, while the sum is 52.

The square root of 717385993 is about 26784.0622945811. The cubic root of 717385993 is about 895.1949651725.

The spelling of 717385993 in words is "seven hundred seventeen million, three hundred eighty-five thousand, nine hundred ninety-three".