1267865281 has 2 divisors, whose sum is σ = 1267865282. Its totient is φ = 1267865280.

The previous prime is 1267865237. The next prime is 1267865293. The reversal of 1267865281 is 1825687621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 995087025 + 272778256 = 31545^2 + 16516^2 .

It is a cyclic number.

It is not a de Polignac number, because 1267865281 - 2¹³ = 1267857089 is a prime.

It is a super-3 number, since 3×1267865281³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1267865201) 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, 633932640 + 633932641.

It is an arithmetic number, because the mean of its divisors is an integer number (633932641).

Almost surely, 2^1267865281 is an apocalyptic number.

It is an amenable number.

1267865281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267865281 is an equidigital number, since it uses as much as digits as its factorization.

1267865281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 46.

The square root of 1267865281 is about 35607.0959360631. The cubic root of 1267865281 is about 1082.3250324979.

The spelling of 1267865281 in words is "one billion, two hundred sixty-seven million, eight hundred sixty-five thousand, two hundred eighty-one".