863491859 has 2 divisors, whose sum is σ = 863491860. Its totient is φ = 863491858.

The previous prime is 863491831. The next prime is 863491861. The reversal of 863491859 is 958194368.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 863491859 - 2¹⁶ = 863426323 is a prime.

Together with 863491861, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 863491859.

It is not a weakly prime, because it can be changed into another prime (863431859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431745929 + 431745930.

It is an arithmetic number, because the mean of its divisors is an integer number (431745930).

Almost surely, 2^863491859 is an apocalyptic number.

863491859 is a deficient number, since it is larger than the sum of its proper divisors (1).

863491859 is an equidigital number, since it uses as much as digits as its factorization.

863491859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 53.

The square root of 863491859 is about 29385.2319881943. The cubic root of 863491859 is about 952.2538761481.

The spelling of 863491859 in words is "eight hundred sixty-three million, four hundred ninety-one thousand, eight hundred fifty-nine".