1279741847 has 2 divisors, whose sum is σ = 1279741848. Its totient is φ = 1279741846.

The previous prime is 1279741717. The next prime is 1279741849. The reversal of 1279741847 is 7481479721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1279741847 - 2²⁰ = 1278693271 is a prime.

Together with 1279741849, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1279741795 and 1279741804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1279741849) 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, 639870923 + 639870924.

It is an arithmetic number, because the mean of its divisors is an integer number (639870924).

Almost surely, 2^1279741847 is an apocalyptic number.

1279741847 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279741847 is an equidigital number, since it uses as much as digits as its factorization.

1279741847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 790272, while the sum is 50.

The square root of 1279741847 is about 35773.4796602176. The cubic root of 1279741847 is about 1085.6940484958.

The spelling of 1279741847 in words is "one billion, two hundred seventy-nine million, seven hundred forty-one thousand, eight hundred forty-seven".