1272688217 has 2 divisors, whose sum is σ = 1272688218. Its totient is φ = 1272688216.

The previous prime is 1272688177. The next prime is 1272688237. The reversal of 1272688217 is 7128862721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1252876816 + 19811401 = 35396^2 + 4451^2 .

It is an emirp because it is prime and its reverse (7128862721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1272688217 - 2¹⁸ = 1272426073 is a prime.

It is not a weakly prime, because it can be changed into another prime (1272688237) 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, 636344108 + 636344109.

It is an arithmetic number, because the mean of its divisors is an integer number (636344109).

Almost surely, 2^1272688217 is an apocalyptic number.

It is an amenable number.

1272688217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272688217 is an equidigital number, since it uses as much as digits as its factorization.

1272688217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 150528, while the sum is 44.

The square root of 1272688217 is about 35674.7560187873. The cubic root of 1272688217 is about 1083.6956774410.

The spelling of 1272688217 in words is "one billion, two hundred seventy-two million, six hundred eighty-eight thousand, two hundred seventeen".