1278416317 has 2 divisors, whose sum is σ = 1278416318. Its totient is φ = 1278416316.

The previous prime is 1278416297. The next prime is 1278416323. The reversal of 1278416317 is 7136148721.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 974750841 + 303665476 = 31221^2 + 17426^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278416317 - 2²³ = 1270027709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1278416317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1278416017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639208158 + 639208159.

It is an arithmetic number, because the mean of its divisors is an integer number (639208159).

Almost surely, 2^1278416317 is an apocalyptic number.

It is an amenable number.

1278416317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278416317 is an equidigital number, since it uses as much as digits as its factorization.

1278416317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 40.

The square root of 1278416317 is about 35754.9481470747. The cubic root of 1278416317 is about 1085.3190725604.

The spelling of 1278416317 in words is "one billion, two hundred seventy-eight million, four hundred sixteen thousand, three hundred seventeen".