1272209249 has 2 divisors, whose sum is σ = 1272209250. Its totient is φ = 1272209248.

The previous prime is 1272209243. The next prime is 1272209261. The reversal of 1272209249 is 9429022721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1272206224 + 3025 = 35668^2 + 55^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1272209249 is a prime.

It is a super-2 number, since 2×1272209249² = 3237032746482288002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1272209243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636104624 + 636104625.

It is an arithmetic number, because the mean of its divisors is an integer number (636104625).

Almost surely, 2^1272209249 is an apocalyptic number.

It is an amenable number.

1272209249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272209249 is an equidigital number, since it uses as much as digits as its factorization.

1272209249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 1272209249 is about 35668.0424049316. The cubic root of 1272209249 is about 1083.5597130908.

The spelling of 1272209249 in words is "one billion, two hundred seventy-two million, two hundred nine thousand, two hundred forty-nine".