1279454549 has 2 divisors, whose sum is σ = 1279454550. Its totient is φ = 1279454548.

The previous prime is 1279454513. The next prime is 1279454563. The reversal of 1279454549 is 9454549721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 784392049 + 495062500 = 28007^2 + 22250^2 .

It is an emirp because it is prime and its reverse (9454549721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1279454549 - 2¹² = 1279450453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1279454497 and 1279454506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1279454749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639727274 + 639727275.

It is an arithmetic number, because the mean of its divisors is an integer number (639727275).

Almost surely, 2^1279454549 is an apocalyptic number.

It is an amenable number.

1279454549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279454549 is an equidigital number, since it uses as much as digits as its factorization.

1279454549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 50.

The square root of 1279454549 is about 35769.4639182641. The cubic root of 1279454549 is about 1085.6127974544.

The spelling of 1279454549 in words is "one billion, two hundred seventy-nine million, four hundred fifty-four thousand, five hundred forty-nine".