1272823549 has 2 divisors, whose sum is σ = 1272823550. Its totient is φ = 1272823548.

The previous prime is 1272823493. The next prime is 1272823619. The reversal of 1272823549 is 9453282721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1239392025 + 33431524 = 35205^2 + 5782^2 .

It is an emirp because it is prime and its reverse (9453282721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1272823549 - 2¹⁵ = 1272790781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1272823049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636411774 + 636411775.

It is an arithmetic number, because the mean of its divisors is an integer number (636411775).

Almost surely, 2^1272823549 is an apocalyptic number.

It is an amenable number.

1272823549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272823549 is an equidigital number, since it uses as much as digits as its factorization.

1272823549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 43.

The square root of 1272823549 is about 35676.6527157468. The cubic root of 1272823549 is about 1083.7340878711.

The spelling of 1272823549 in words is "one billion, two hundred seventy-two million, eight hundred twenty-three thousand, five hundred forty-nine".