859039891 has 2 divisors, whose sum is σ = 859039892. Its totient is φ = 859039890.

The previous prime is 859039873. The next prime is 859039927. The reversal of 859039891 is 198930958.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 859039891 - 2⁵ = 859039859 is a prime.

It is not a weakly prime, because it can be changed into another prime (859039861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429519945 + 429519946.

It is an arithmetic number, because the mean of its divisors is an integer number (429519946).

Almost surely, 2^859039891 is an apocalyptic number.

859039891 is a deficient number, since it is larger than the sum of its proper divisors (1).

859039891 is an equidigital number, since it uses as much as digits as its factorization.

859039891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 52.

The square root of 859039891 is about 29309.3823032830. The cubic root of 859039891 is about 950.6145205934.

The spelling of 859039891 in words is "eight hundred fifty-nine million, thirty-nine thousand, eight hundred ninety-one".