84959891 has 2 divisors, whose sum is σ = 84959892. Its totient is φ = 84959890.

The previous prime is 84959857. The next prime is 84959893. The reversal of 84959891 is 19895948.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84959891 - 2¹⁸ = 84697747 is a prime.

Together with 84959893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84959893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42479945 + 42479946.

It is an arithmetic number, because the mean of its divisors is an integer number (42479946).

Almost surely, 2^84959891 is an apocalyptic number.

84959891 is a deficient number, since it is larger than the sum of its proper divisors (1).

84959891 is an equidigital number, since it uses as much as digits as its factorization.

84959891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 53.

The square root of 84959891 is about 9217.3689846941. The cubic root of 84959891 is about 439.6137985150.

The spelling of 84959891 in words is "eighty-four million, nine hundred fifty-nine thousand, eight hundred ninety-one".