1281919259 has 2 divisors, whose sum is σ = 1281919260. Its totient is φ = 1281919258.

The previous prime is 1281919211. The next prime is 1281919267. The reversal of 1281919259 is 9529191821.

It is a strong prime.

It is an emirp because it is prime and its reverse (9529191821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1281919259 - 2¹⁶ = 1281853723 is a prime.

It is not a weakly prime, because it can be changed into another prime (1281969259) 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, 640959629 + 640959630.

It is an arithmetic number, because the mean of its divisors is an integer number (640959630).

Almost surely, 2^1281919259 is an apocalyptic number.

1281919259 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281919259 is an equidigital number, since it uses as much as digits as its factorization.

1281919259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 47.

The square root of 1281919259 is about 35803.9000529272. The cubic root of 1281919259 is about 1086.3094496356.

The spelling of 1281919259 in words is "one billion, two hundred eighty-one million, nine hundred nineteen thousand, two hundred fifty-nine".