1996813909 has 2 divisors, whose sum is σ = 1996813910. Its totient is φ = 1996813908.

The previous prime is 1996813859. The next prime is 1996813913. The reversal of 1996813909 is 9093186991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1311526225 + 685287684 = 36215^2 + 26178^2 .

It is a cyclic number.

It is not a de Polignac number, because 1996813909 - 2⁷ = 1996813781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1996813909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1996813109) 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, 998406954 + 998406955.

It is an arithmetic number, because the mean of its divisors is an integer number (998406955).

Almost surely, 2^1996813909 is an apocalyptic number.

It is an amenable number.

1996813909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1996813909 is an equidigital number, since it uses as much as digits as its factorization.

1996813909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 944784, while the sum is 55.

The square root of 1996813909 is about 44685.7237716925. The cubic root of 1996813909 is about 1259.2516571249.

The spelling of 1996813909 in words is "one billion, nine hundred ninety-six million, eight hundred thirteen thousand, nine hundred nine".