996743809 has 2 divisors, whose sum is σ = 996743810. Its totient is φ = 996743808.

The previous prime is 996743807. The next prime is 996743863. The reversal of 996743809 is 908347699.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 880427584 + 116316225 = 29672^2 + 10785^2 .

It is a cyclic number.

It is not a de Polignac number, because 996743809 - 2¹ = 996743807 is a prime.

Together with 996743807, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 996743809.

It is not a weakly prime, because it can be changed into another prime (996743807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498371904 + 498371905.

It is an arithmetic number, because the mean of its divisors is an integer number (498371905).

Almost surely, 2^996743809 is an apocalyptic number.

It is an amenable number.

996743809 is a deficient number, since it is larger than the sum of its proper divisors (1).

996743809 is an equidigital number, since it uses as much as digits as its factorization.

996743809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The square root of 996743809 is about 31571.2497218593. The cubic root of 996743809 is about 998.9134227776.

The spelling of 996743809 in words is "nine hundred ninety-six million, seven hundred forty-three thousand, eight hundred nine".