996818993 has 2 divisors, whose sum is σ = 996818994. Its totient is φ = 996818992.

The previous prime is 996818951. The next prime is 996819007. The reversal of 996818993 is 399818699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 547887649 + 448931344 = 23407^2 + 21188^2 .

It is a cyclic number.

It is not a de Polignac number, because 996818993 - 2⁶ = 996818929 is a prime.

It is not a weakly prime, because it can be changed into another prime (996818293) 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, 498409496 + 498409497.

It is an arithmetic number, because the mean of its divisors is an integer number (498409497).

Almost surely, 2^996818993 is an apocalyptic number.

It is an amenable number.

996818993 is a deficient number, since it is larger than the sum of its proper divisors (1).

996818993 is an equidigital number, since it uses as much as digits as its factorization.

996818993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7558272, while the sum is 62.

The square root of 996818993 is about 31572.4404029844. The cubic root of 996818993 is about 998.9385380305.

The spelling of 996818993 in words is "nine hundred ninety-six million, eight hundred eighteen thousand, nine hundred ninety-three".