1278982013 has 2 divisors, whose sum is σ = 1278982014. Its totient is φ = 1278982012.

The previous prime is 1278982009. The next prime is 1278982027. The reversal of 1278982013 is 3102898721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 727812484 + 551169529 = 26978^2 + 23477^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278982013 - 2² = 1278982009 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1278982513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639491006 + 639491007.

It is an arithmetic number, because the mean of its divisors is an integer number (639491007).

Almost surely, 2^1278982013 is an apocalyptic number.

It is an amenable number.

1278982013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278982013 is an equidigital number, since it uses as much as digits as its factorization.

1278982013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 1278982013 is about 35762.8580093929. The cubic root of 1278982013 is about 1085.4791326059.

The spelling of 1278982013 in words is "one billion, two hundred seventy-eight million, nine hundred eighty-two thousand, thirteen".