1276367899 has 2 divisors, whose sum is σ = 1276367900. Its totient is φ = 1276367898.

The previous prime is 1276367893. The next prime is 1276367903. The reversal of 1276367899 is 9987636721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1276367899 - 2¹⁷ = 1276236827 is a prime.

It is not a weakly prime, because it can be changed into another prime (1276367893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638183949 + 638183950.

It is an arithmetic number, because the mean of its divisors is an integer number (638183950).

Almost surely, 2^1276367899 is an apocalyptic number.

1276367899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276367899 is an equidigital number, since it uses as much as digits as its factorization.

1276367899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6858432, while the sum is 58.

The square root of 1276367899 is about 35726.2914252235. The cubic root of 1276367899 is about 1084.7390904989.

The spelling of 1276367899 in words is "one billion, two hundred seventy-six million, three hundred sixty-seven thousand, eight hundred ninety-nine".