1996809281 has 2 divisors, whose sum is σ = 1996809282. Its totient is φ = 1996809280.

The previous prime is 1996809277. The next prime is 1996809329. The reversal of 1996809281 is 1829086991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1141831681 + 854977600 = 33791^2 + 29240^2 .

It is a cyclic number.

It is not a de Polignac number, because 1996809281 - 2² = 1996809277 is a prime.

It is a super-2 number, since 2×1996809281² = 7974494609375473922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1996809271) 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, 998404640 + 998404641.

It is an arithmetic number, because the mean of its divisors is an integer number (998404641).

Almost surely, 2^1996809281 is an apocalyptic number.

It is an amenable number.

1996809281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1996809281 is an equidigital number, since it uses as much as digits as its factorization.

1996809281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 53.

The square root of 1996809281 is about 44685.6719877860. The cubic root of 1996809281 is about 1259.2506842716.

The spelling of 1996809281 in words is "one billion, nine hundred ninety-six million, eight hundred nine thousand, two hundred eighty-one".