996409391 has 2 divisors, whose sum is σ = 996409392. Its totient is φ = 996409390.

The previous prime is 996409387. The next prime is 996409411. The reversal of 996409391 is 193904699.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (193904699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 996409391 - 2² = 996409387 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (996409301) 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, 498204695 + 498204696.

It is an arithmetic number, because the mean of its divisors is an integer number (498204696).

Almost surely, 2^996409391 is an apocalyptic number.

996409391 is a deficient number, since it is larger than the sum of its proper divisors (1).

996409391 is an equidigital number, since it uses as much as digits as its factorization.

996409391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 472392, while the sum is 50.

The square root of 996409391 is about 31565.9530348760. The cubic root of 996409391 is about 998.8016949720.

The spelling of 996409391 in words is "nine hundred ninety-six million, four hundred nine thousand, three hundred ninety-one".