847999091 has 2 divisors, whose sum is σ = 847999092. Its totient is φ = 847999090.

The previous prime is 847999043. The next prime is 847999109. The reversal of 847999091 is 190999748.

847999091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (847999109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-847999091 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (847999021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 423999545 + 423999546.

It is an arithmetic number, because the mean of its divisors is an integer number (423999546).

Almost surely, 2^847999091 is an apocalyptic number.

847999091 is a deficient number, since it is larger than the sum of its proper divisors (1).

847999091 is an equidigital number, since it uses as much as digits as its factorization.

847999091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 56.

The square root of 847999091 is about 29120.4239495238. The cubic root of 847999091 is about 946.5243600286.

The spelling of 847999091 in words is "eight hundred forty-seven million, nine hundred ninety-nine thousand, ninety-one".