1271097209 has 2 divisors, whose sum is σ = 1271097210. Its totient is φ = 1271097208.

The previous prime is 1271097181. The next prime is 1271097253. The reversal of 1271097209 is 9027901721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1241011984 + 30085225 = 35228^2 + 5485^2 .

It is an emirp because it is prime and its reverse (9027901721) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1271097209 is a prime.

It is a super-2 number, since 2×1271097209² = 3231376229455179362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1271067209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635548604 + 635548605.

It is an arithmetic number, because the mean of its divisors is an integer number (635548605).

Almost surely, 2^1271097209 is an apocalyptic number.

It is an amenable number.

1271097209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271097209 is an equidigital number, since it uses as much as digits as its factorization.

1271097209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 1271097209 is about 35652.4502524020. The cubic root of 1271097209 is about 1083.2439073376.

The spelling of 1271097209 in words is "one billion, two hundred seventy-one million, ninety-seven thousand, two hundred nine".