859846921 has 2 divisors, whose sum is σ = 859846922. Its totient is φ = 859846920.

The previous prime is 859846909. The next prime is 859846937. The reversal of 859846921 is 129648958.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 754271296 + 105575625 = 27464^2 + 10275^2 .

It is a cyclic number.

It is not a de Polignac number, because 859846921 - 2¹³ = 859838729 is a prime.

It is not a weakly prime, because it can be changed into another prime (859841921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429923460 + 429923461.

It is an arithmetic number, because the mean of its divisors is an integer number (429923461).

Almost surely, 2^859846921 is an apocalyptic number.

It is an amenable number.

859846921 is a deficient number, since it is larger than the sum of its proper divisors (1).

859846921 is an equidigital number, since it uses as much as digits as its factorization.

859846921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1244160, while the sum is 52.

The square root of 859846921 is about 29323.1465057896. The cubic root of 859846921 is about 950.9121141928.

The spelling of 859846921 in words is "eight hundred fifty-nine million, eight hundred forty-six thousand, nine hundred twenty-one".