1282668781 has 2 divisors, whose sum is σ = 1282668782. Its totient is φ = 1282668780.

The previous prime is 1282668743. The next prime is 1282668797. The reversal of 1282668781 is 1878662821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1275561225 + 7107556 = 35715^2 + 2666^2 .

It is a cyclic number.

It is not a de Polignac number, because 1282668781 - 2²⁷ = 1148451053 is a prime.

It is a super-2 number, since 2×1282668781² = 3290478403504051922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1282668281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 641334390 + 641334391.

It is an arithmetic number, because the mean of its divisors is an integer number (641334391).

Almost surely, 2^1282668781 is an apocalyptic number.

It is an amenable number.

1282668781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1282668781 is an equidigital number, since it uses as much as digits as its factorization.

1282668781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 49.

The square root of 1282668781 is about 35814.3655674647. The cubic root of 1282668781 is about 1086.5211255246.

The spelling of 1282668781 in words is "one billion, two hundred eighty-two million, six hundred sixty-eight thousand, seven hundred eighty-one".