1278973159 has 2 divisors, whose sum is σ = 1278973160. Its totient is φ = 1278973158.

The previous prime is 1278973151. The next prime is 1278973187. The reversal of 1278973159 is 9513798721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1278973159 - 2³ = 1278973151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1278973151) 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, 639486579 + 639486580.

It is an arithmetic number, because the mean of its divisors is an integer number (639486580).

Almost surely, 2^1278973159 is an apocalyptic number.

1278973159 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278973159 is an equidigital number, since it uses as much as digits as its factorization.

1278973159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 52.

The square root of 1278973159 is about 35762.7342215329. The cubic root of 1278973159 is about 1085.4766277872.

The spelling of 1278973159 in words is "one billion, two hundred seventy-eight million, nine hundred seventy-three thousand, one hundred fifty-nine".