863497821317 has 2 divisors, whose sum is σ = 863497821318. Its totient is φ = 863497821316.

The previous prime is 863497821301. The next prime is 863497821323. The reversal of 863497821317 is 713128794368.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 565069427521 + 298428393796 = 751711^2 + 546286^2 .

It is a cyclic number.

It is not a de Polignac number, because 863497821317 - 2⁴ = 863497821301 is a prime.

It is a super-2 number, since 2×863497821317² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (863497821617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431748910658 + 431748910659.

It is an arithmetic number, because the mean of its divisors is an integer number (431748910659).

Almost surely, 2^863497821317 is an apocalyptic number.

It is an amenable number.

863497821317 is a deficient number, since it is larger than the sum of its proper divisors (1).

863497821317 is an equidigital number, since it uses as much as digits as its factorization.

863497821317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12192768, while the sum is 59.

The spelling of 863497821317 in words is "eight hundred sixty-three billion, four hundred ninety-seven million, eight hundred twenty-one thousand, three hundred seventeen".