86643943 has 2 divisors, whose sum is σ = 86643944. Its totient is φ = 86643942.

The previous prime is 86643941. The next prime is 86644007. The reversal of 86643943 is 34934668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 86643943 - 2¹ = 86643941 is a prime.

Together with 86643941, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 86643943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86643941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43321971 + 43321972.

It is an arithmetic number, because the mean of its divisors is an integer number (43321972).

Almost surely, 2^86643943 is an apocalyptic number.

86643943 is a deficient number, since it is larger than the sum of its proper divisors (1).

86643943 is an equidigital number, since it uses as much as digits as its factorization.

86643943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 43.

The square root of 86643943 is about 9308.2728258254. The cubic root of 86643943 is about 442.4994507744.

The spelling of 86643943 in words is "eighty-six million, six hundred forty-three thousand, nine hundred forty-three".