845639983 has 2 divisors, whose sum is σ = 845639984. Its totient is φ = 845639982.

The previous prime is 845639969. The next prime is 845639987. The reversal of 845639983 is 389936548.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-845639983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (845639987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422819991 + 422819992.

It is an arithmetic number, because the mean of its divisors is an integer number (422819992).

Almost surely, 2^845639983 is an apocalyptic number.

845639983 is a deficient number, since it is larger than the sum of its proper divisors (1).

845639983 is an equidigital number, since it uses as much as digits as its factorization.

845639983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5598720, while the sum is 55.

The square root of 845639983 is about 29079.8896662281. The cubic root of 845639983 is about 945.6458107119.

The spelling of 845639983 in words is "eight hundred forty-five million, six hundred thirty-nine thousand, nine hundred eighty-three".