1278782932949 has 2 divisors, whose sum is σ = 1278782932950. Its totient is φ = 1278782932948.

The previous prime is 1278782932913. The next prime is 1278782932961. The reversal of 1278782932949 is 9492392878721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1130755756900 + 148027176049 = 1063370^2 + 384743^2 .

It is an emirp because it is prime and its reverse (9492392878721) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1278782932949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1278782931949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639391466474 + 639391466475.

It is an arithmetic number, because the mean of its divisors is an integer number (639391466475).

Almost surely, 2^{1278782932949} is an apocalyptic number.

It is an amenable number.

1278782932949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278782932949 is an equidigital number, since it uses as much as digits as its factorization.

1278782932949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 219469824, while the sum is 71.

The spelling of 1278782932949 in words is "one trillion, two hundred seventy-eight billion, seven hundred eighty-two million, nine hundred thirty-two thousand, nine hundred forty-nine".