84943891 has 2 divisors, whose sum is σ = 84943892. Its totient is φ = 84943890.

The previous prime is 84943879. The next prime is 84943909. The reversal of 84943891 is 19834948.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84943891 is a prime.

It is not a weakly prime, because it can be changed into another prime (84343891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42471945 + 42471946.

It is an arithmetic number, because the mean of its divisors is an integer number (42471946).

Almost surely, 2^84943891 is an apocalyptic number.

84943891 is a deficient number, since it is larger than the sum of its proper divisors (1).

84943891 is an equidigital number, since it uses as much as digits as its factorization.

84943891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 46.

The square root of 84943891 is about 9216.5010171974. The cubic root of 84943891 is about 439.5862001495.

The spelling of 84943891 in words is "eighty-four million, nine hundred forty-three thousand, eight hundred ninety-one".