717318397 has 2 divisors, whose sum is σ = 717318398. Its totient is φ = 717318396.

The previous prime is 717318361. The next prime is 717318409. The reversal of 717318397 is 793813717.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 459202041 + 258116356 = 21429^2 + 16066^2 .

It is a cyclic number.

It is not a de Polignac number, because 717318397 - 2¹⁵ = 717285629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (717318347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 358659198 + 358659199.

It is an arithmetic number, because the mean of its divisors is an integer number (358659199).

Almost surely, 2^717318397 is an apocalyptic number.

It is an amenable number.

717318397 is a deficient number, since it is larger than the sum of its proper divisors (1).

717318397 is an equidigital number, since it uses as much as digits as its factorization.

717318397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 222264, while the sum is 46.

The square root of 717318397 is about 26782.8003950296. The cubic root of 717318397 is about 895.1668475807.

The spelling of 717318397 in words is "seven hundred seventeen million, three hundred eighteen thousand, three hundred ninety-seven".