84985891 has 2 divisors, whose sum is σ = 84985892. Its totient is φ = 84985890.

The previous prime is 84985877. The next prime is 84985913. The reversal of 84985891 is 19858948.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84985891 - 2⁷ = 84985763 is a prime.

It is not a weakly prime, because it can be changed into another prime (84985801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42492945 + 42492946.

It is an arithmetic number, because the mean of its divisors is an integer number (42492946).

Almost surely, 2^84985891 is an apocalyptic number.

84985891 is a deficient number, since it is larger than the sum of its proper divisors (1).

84985891 is an equidigital number, since it uses as much as digits as its factorization.

84985891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 52.

The square root of 84985891 is about 9218.7792575807. The cubic root of 84985891 is about 439.6586384697.

The spelling of 84985891 in words is "eighty-four million, nine hundred eighty-five thousand, eight hundred ninety-one".