1282868981 has 2 divisors, whose sum is σ = 1282868982. Its totient is φ = 1282868980.

The previous prime is 1282868957. The next prime is 1282868989. The reversal of 1282868981 is 1898682821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1255568356 + 27300625 = 35434^2 + 5225^2 .

It is a cyclic number.

It is not a de Polignac number, because 1282868981 - 2³⁰ = 209127157 is a prime.

It is a super-3 number, since 3×1282868981³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1282868989) 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, 641434490 + 641434491.

It is an arithmetic number, because the mean of its divisors is an integer number (641434491).

Almost surely, 2^1282868981 is an apocalyptic number.

It is an amenable number.

1282868981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1282868981 is an equidigital number, since it uses as much as digits as its factorization.

1282868981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 884736, while the sum is 53.

The square root of 1282868981 is about 35817.1604262538. The cubic root of 1282868981 is about 1086.5776509546.

The spelling of 1282868981 in words is "one billion, two hundred eighty-two million, eight hundred sixty-eight thousand, nine hundred eighty-one".