863844997 has 2 divisors, whose sum is σ = 863844998. Its totient is φ = 863844996.

The previous prime is 863844991. The next prime is 863845057. The reversal of 863844997 is 799448368.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 441378081 + 422466916 = 21009^2 + 20554^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-863844997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (863844991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431922498 + 431922499.

It is an arithmetic number, because the mean of its divisors is an integer number (431922499).

Almost surely, 2^863844997 is an apocalyptic number.

It is an amenable number.

863844997 is a deficient number, since it is larger than the sum of its proper divisors (1).

863844997 is an equidigital number, since it uses as much as digits as its factorization.

863844997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10450944, while the sum is 58.

The square root of 863844997 is about 29391.2401405589. The cubic root of 863844997 is about 952.3836713104.

It can be divided in two parts, 8638 and 44997, that added together give a palindrome (53635).

The spelling of 863844997 in words is "eight hundred sixty-three million, eight hundred forty-four thousand, nine hundred ninety-seven".