83216891 has 2 divisors, whose sum is σ = 83216892. Its totient is φ = 83216890.

The previous prime is 83216873. The next prime is 83216897. The reversal of 83216891 is 19861238.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83216891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (83216897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41608445 + 41608446.

It is an arithmetic number, because the mean of its divisors is an integer number (41608446).

Almost surely, 2^83216891 is an apocalyptic number.

83216891 is a deficient number, since it is larger than the sum of its proper divisors (1).

83216891 is an equidigital number, since it uses as much as digits as its factorization.

83216891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 83216891 is about 9122.3292529924. The cubic root of 83216891 is about 436.5866940414.

The spelling of 83216891 in words is "eighty-three million, two hundred sixteen thousand, eight hundred ninety-one".