861289063 has 2 divisors, whose sum is σ = 861289064. Its totient is φ = 861289062.

The previous prime is 861289049. The next prime is 861289069. The reversal of 861289063 is 360982168.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 861289063 - 2²⁵ = 827734631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861289069) 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, 430644531 + 430644532.

It is an arithmetic number, because the mean of its divisors is an integer number (430644532).

Almost surely, 2^861289063 is an apocalyptic number.

861289063 is a deficient number, since it is larger than the sum of its proper divisors (1).

861289063 is an equidigital number, since it uses as much as digits as its factorization.

861289063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 861289063 is about 29347.7267092359. The cubic root of 861289063 is about 951.4434430059.

The spelling of 861289063 in words is "eight hundred sixty-one million, two hundred eighty-nine thousand, sixty-three".