1279696447 has 2 divisors, whose sum is σ = 1279696448. Its totient is φ = 1279696446.

The previous prime is 1279696421. The next prime is 1279696477. The reversal of 1279696447 is 7446969721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1279696447 - 2¹⁹ = 1279172159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1279696477) 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, 639848223 + 639848224.

It is an arithmetic number, because the mean of its divisors is an integer number (639848224).

Almost surely, 2^1279696447 is an apocalyptic number.

1279696447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279696447 is an equidigital number, since it uses as much as digits as its factorization.

1279696447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4572288, while the sum is 55.

The square root of 1279696447 is about 35772.8451063093. The cubic root of 1279696447 is about 1085.6812096844.

The spelling of 1279696447 in words is "one billion, two hundred seventy-nine million, six hundred ninety-six thousand, four hundred forty-seven".