1278863959 has 2 divisors, whose sum is σ = 1278863960. Its totient is φ = 1278863958.

The previous prime is 1278863941. The next prime is 1278863969. The reversal of 1278863959 is 9593688721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1278863959 - 2¹¹ = 1278861911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1278863909) 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, 639431979 + 639431980.

It is an arithmetic number, because the mean of its divisors is an integer number (639431980).

Almost surely, 2^1278863959 is an apocalyptic number.

1278863959 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278863959 is an equidigital number, since it uses as much as digits as its factorization.

1278863959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 58.

The square root of 1278863959 is about 35761.2074600397. The cubic root of 1278863959 is about 1085.4457338833.

The spelling of 1278863959 in words is "one billion, two hundred seventy-eight million, eight hundred sixty-three thousand, nine hundred fifty-nine".