1266272281 has 2 divisors, whose sum is σ = 1266272282. Its totient is φ = 1266272280.

The previous prime is 1266272279. The next prime is 1266272297. The reversal of 1266272281 is 1822726621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 785961225 + 480311056 = 28035^2 + 21916^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266272281 - 2¹ = 1266272279 is a prime.

It is a super-2 number, since 2×1266272281² = 3206890979257885922, which contains 22 as substring.

Together with 1266272279, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1266272281.

It is not a weakly prime, because it can be changed into another prime (1266222281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633136140 + 633136141.

It is an arithmetic number, because the mean of its divisors is an integer number (633136141).

Almost surely, 2^1266272281 is an apocalyptic number.

It is an amenable number.

1266272281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266272281 is an equidigital number, since it uses as much as digits as its factorization.

1266272281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 1266272281 is about 35584.7197684624. The cubic root of 1266272281 is about 1081.8715494129.

The spelling of 1266272281 in words is "one billion, two hundred sixty-six million, two hundred seventy-two thousand, two hundred eighty-one".