816988943 has 2 divisors, whose sum is σ = 816988944. Its totient is φ = 816988942.

The previous prime is 816988901. The next prime is 816988981. The reversal of 816988943 is 349889618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 816988943 - 2²⁸ = 548553487 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816988993) 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, 408494471 + 408494472.

It is an arithmetic number, because the mean of its divisors is an integer number (408494472).

Almost surely, 2^816988943 is an apocalyptic number.

816988943 is a deficient number, since it is larger than the sum of its proper divisors (1).

816988943 is an equidigital number, since it uses as much as digits as its factorization.

816988943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2985984, while the sum is 56.

The square root of 816988943 is about 28583.0184375269. The cubic root of 816988943 is about 934.8430987257.

The spelling of 816988943 in words is "eight hundred sixteen million, nine hundred eighty-eight thousand, nine hundred forty-three".