1247281289 has 2 divisors, whose sum is σ = 1247281290. Its totient is φ = 1247281288.

The previous prime is 1247281267. The next prime is 1247281297. The reversal of 1247281289 is 9821827421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1169982025 + 77299264 = 34205^2 + 8792^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1247281289 is a prime.

It is a super-2 number, since 2×1247281289² = 3111421227779003042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1247281229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623640644 + 623640645.

It is an arithmetic number, because the mean of its divisors is an integer number (623640645).

Almost surely, 2^1247281289 is an apocalyptic number.

It is an amenable number.

1247281289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247281289 is an equidigital number, since it uses as much as digits as its factorization.

1247281289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 44.

The square root of 1247281289 is about 35316.8697508712. The cubic root of 1247281289 is about 1076.4358067626.

The spelling of 1247281289 in words is "one billion, two hundred forty-seven million, two hundred eighty-one thousand, two hundred eighty-nine".