1278864017 has 2 divisors, whose sum is σ = 1278864018. Its totient is φ = 1278864016.

The previous prime is 1278863969. The next prime is 1278864023. The reversal of 1278864017 is 7104688721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1094881921 + 183982096 = 33089^2 + 13564^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278864017 - 2¹⁰ = 1278862993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1278864047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639432008 + 639432009.

It is an arithmetic number, because the mean of its divisors is an integer number (639432009).

Almost surely, 2^1278864017 is an apocalyptic number.

It is an amenable number.

1278864017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278864017 is an equidigital number, since it uses as much as digits as its factorization.

1278864017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150528, while the sum is 44.

The square root of 1278864017 is about 35761.2082709743. The cubic root of 1278864017 is about 1085.4457502926.

The spelling of 1278864017 in words is "one billion, two hundred seventy-eight million, eight hundred sixty-four thousand, seventeen".