1272828217 has 2 divisors, whose sum is σ = 1272828218. Its totient is φ = 1272828216.

The previous prime is 1272828209. The next prime is 1272828281. The reversal of 1272828217 is 7128282721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1251815161 + 21013056 = 35381^2 + 4584^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272828217 - 2³ = 1272828209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1272828217.

It is not a weakly prime, because it can be changed into another prime (1272828017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636414108 + 636414109.

It is an arithmetic number, because the mean of its divisors is an integer number (636414109).

Almost surely, 2^1272828217 is an apocalyptic number.

It is an amenable number.

1272828217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272828217 is an equidigital number, since it uses as much as digits as its factorization.

1272828217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50176, while the sum is 40.

The square root of 1272828217 is about 35676.7181366224. The cubic root of 1272828217 is about 1083.7354127116.

The spelling of 1272828217 in words is "one billion, two hundred seventy-two million, eight hundred twenty-eight thousand, two hundred seventeen".