1279050821 has 2 divisors, whose sum is σ = 1279050822. Its totient is φ = 1279050820.

The previous prime is 1279050767. The next prime is 1279050823. The reversal of 1279050821 is 1280509721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 830246596 + 448804225 = 28814^2 + 21185^2 .

It is an emirp because it is prime and its reverse (1280509721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1279050821 - 2¹⁰ = 1279049797 is a prime.

Together with 1279050823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1279050823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639525410 + 639525411.

It is an arithmetic number, because the mean of its divisors is an integer number (639525411).

Almost surely, 2^1279050821 is an apocalyptic number.

It is an amenable number.

1279050821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279050821 is an equidigital number, since it uses as much as digits as its factorization.

1279050821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 1279050821 is about 35763.8200001063. The cubic root of 1279050821 is about 1085.4985981673.

The spelling of 1279050821 in words is "one billion, two hundred seventy-nine million, fifty thousand, eight hundred twenty-one".