891290863 has 2 divisors, whose sum is σ = 891290864. Its totient is φ = 891290862.

The previous prime is 891290837. The next prime is 891290867. The reversal of 891290863 is 368092198.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 891290863 - 2²⁵ = 857736431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891290867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445645431 + 445645432.

It is an arithmetic number, because the mean of its divisors is an integer number (445645432).

Almost surely, 2^891290863 is an apocalyptic number.

891290863 is a deficient number, since it is larger than the sum of its proper divisors (1).

891290863 is an equidigital number, since it uses as much as digits as its factorization.

891290863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 891290863 is about 29854.4948542091. The cubic root of 891290863 is about 962.3649961432.

The spelling of 891290863 in words is "eight hundred ninety-one million, two hundred ninety thousand, eight hundred sixty-three".