1280615879 has 2 divisors, whose sum is σ = 1280615880. Its totient is φ = 1280615878.

The previous prime is 1280615863. The next prime is 1280615887. The reversal of 1280615879 is 9785160821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1280615879 - 2⁴ = 1280615863 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1280615849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640307939 + 640307940.

It is an arithmetic number, because the mean of its divisors is an integer number (640307940).

Almost surely, 2^1280615879 is an apocalyptic number.

1280615879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280615879 is an equidigital number, since it uses as much as digits as its factorization.

1280615879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 47.

The square root of 1280615879 is about 35785.6937755858. The cubic root of 1280615879 is about 1085.9411596332.

The spelling of 1280615879 in words is "one billion, two hundred eighty million, six hundred fifteen thousand, eight hundred seventy-nine".