1278204329 has 2 divisors, whose sum is σ = 1278204330. Its totient is φ = 1278204328.

The previous prime is 1278204311. The next prime is 1278204337. The reversal of 1278204329 is 9234028721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1033751104 + 244453225 = 32152^2 + 15635^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278204329 - 2¹⁶ = 1278138793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1278204292 and 1278204301.

It is not a weakly prime, because it can be changed into another prime (1278204349) 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, 639102164 + 639102165.

It is an arithmetic number, because the mean of its divisors is an integer number (639102165).

Almost surely, 2^1278204329 is an apocalyptic number.

It is an amenable number.

1278204329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278204329 is an equidigital number, since it uses as much as digits as its factorization.

1278204329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 1278204329 is about 35751.9835673491. The cubic root of 1278204329 is about 1085.2590797566.

The spelling of 1278204329 in words is "one billion, two hundred seventy-eight million, two hundred four thousand, three hundred twenty-nine".