819995963 has 2 divisors, whose sum is σ = 819995964. Its totient is φ = 819995962.

The previous prime is 819995929. The next prime is 819996029. The reversal of 819995963 is 369599918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 819995963 - 2¹⁰ = 819994939 is a prime.

It is not a weakly prime, because it can be changed into another prime (819995903) 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, 409997981 + 409997982.

It is an arithmetic number, because the mean of its divisors is an integer number (409997982).

Almost surely, 2^819995963 is an apocalyptic number.

819995963 is a deficient number, since it is larger than the sum of its proper divisors (1).

819995963 is an equidigital number, since it uses as much as digits as its factorization.

819995963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4723920, while the sum is 59.

The square root of 819995963 is about 28635.5716373883. The cubic root of 819995963 is about 935.9886262985.

The spelling of 819995963 in words is "eight hundred nineteen million, nine hundred ninety-five thousand, nine hundred sixty-three".