1271268289 has 2 divisors, whose sum is σ = 1271268290. Its totient is φ = 1271268288.

The previous prime is 1271268281. The next prime is 1271268293. The reversal of 1271268289 is 9828621721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1198336689 + 72931600 = 34617^2 + 8540^2 .

It is a cyclic number.

It is not a de Polignac number, because 1271268289 - 2³ = 1271268281 is a prime.

It is a super-2 number, since 2×1271268289² = 3232246125233975042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1271268281) 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, 635634144 + 635634145.

It is an arithmetic number, because the mean of its divisors is an integer number (635634145).

Almost surely, 2^1271268289 is an apocalyptic number.

It is an amenable number.

1271268289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271268289 is an equidigital number, since it uses as much as digits as its factorization.

1271268289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 46.

The square root of 1271268289 is about 35654.8494457626. The cubic root of 1271268289 is about 1083.2925039497.

The spelling of 1271268289 in words is "one billion, two hundred seventy-one million, two hundred sixty-eight thousand, two hundred eighty-nine".