1278061559 has 2 divisors, whose sum is σ = 1278061560. Its totient is φ = 1278061558.

The previous prime is 1278061549. The next prime is 1278061591. The reversal of 1278061559 is 9551608721.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1278061559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1278061549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639030779 + 639030780.

It is an arithmetic number, because the mean of its divisors is an integer number (639030780).

Almost surely, 2^1278061559 is an apocalyptic number.

1278061559 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278061559 is an equidigital number, since it uses as much as digits as its factorization.

1278061559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 44.

The square root of 1278061559 is about 35749.9868391584. The cubic root of 1278061559 is about 1085.2186719740.

The spelling of 1278061559 in words is "one billion, two hundred seventy-eight million, sixty-one thousand, five hundred fifty-nine".