996721823 has 2 divisors, whose sum is σ = 996721824. Its totient is φ = 996721822.

The previous prime is 996721819. The next prime is 996721841. The reversal of 996721823 is 328127699.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 996721823 - 2² = 996721819 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (996721853) 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, 498360911 + 498360912.

It is an arithmetic number, because the mean of its divisors is an integer number (498360912).

Almost surely, 2^996721823 is an apocalyptic number.

996721823 is a deficient number, since it is larger than the sum of its proper divisors (1).

996721823 is an equidigital number, since it uses as much as digits as its factorization.

996721823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 47.

The square root of 996721823 is about 31570.9015233965. The cubic root of 996721823 is about 998.9060781046.

The spelling of 996721823 in words is "nine hundred ninety-six million, seven hundred twenty-one thousand, eight hundred twenty-three".