1276320139 has 2 divisors, whose sum is σ = 1276320140. Its totient is φ = 1276320138.

The previous prime is 1276320137. The next prime is 1276320151. The reversal of 1276320139 is 9310236721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1276320139 - 2¹ = 1276320137 is a prime.

Together with 1276320137, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1276320137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638160069 + 638160070.

It is an arithmetic number, because the mean of its divisors is an integer number (638160070).

Almost surely, 2^1276320139 is an apocalyptic number.

1276320139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276320139 is an equidigital number, since it uses as much as digits as its factorization.

1276320139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 1276320139 is about 35725.6230036650. The cubic root of 1276320139 is about 1084.7255604957.

The spelling of 1276320139 in words is "one billion, two hundred seventy-six million, three hundred twenty thousand, one hundred thirty-nine".