1279672291 has 2 divisors, whose sum is σ = 1279672292. Its totient is φ = 1279672290.

The previous prime is 1279672283. The next prime is 1279672369. The reversal of 1279672291 is 1922769721.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1922769721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1279672291 - 2³ = 1279672283 is a prime.

It is a super-2 number, since 2×1279672291² = 3275122344706377362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1279672271) 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, 639836145 + 639836146.

It is an arithmetic number, because the mean of its divisors is an integer number (639836146).

Almost surely, 2^1279672291 is an apocalyptic number.

1279672291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279672291 is an equidigital number, since it uses as much as digits as its factorization.

1279672291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 46.

The square root of 1279672291 is about 35772.5074743161. The cubic root of 1279672291 is about 1085.6743784080.

The spelling of 1279672291 in words is "one billion, two hundred seventy-nine million, six hundred seventy-two thousand, two hundred ninety-one".