1281839963 has 2 divisors, whose sum is σ = 1281839964. Its totient is φ = 1281839962.

The previous prime is 1281839941. The next prime is 1281839969. The reversal of 1281839963 is 3699381821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1281839963 is a prime.

It is a super-2 number, since 2×1281839963² = 3286227381487682738, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1281839969) 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, 640919981 + 640919982.

It is an arithmetic number, because the mean of its divisors is an integer number (640919982).

Almost surely, 2^1281839963 is an apocalyptic number.

1281839963 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281839963 is an equidigital number, since it uses as much as digits as its factorization.

1281839963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 50.

The square root of 1281839963 is about 35802.7926704049. The cubic root of 1281839963 is about 1086.2870504687.

The spelling of 1281839963 in words is "one billion, two hundred eighty-one million, eight hundred thirty-nine thousand, nine hundred sixty-three".