1276418491 has 2 divisors, whose sum is σ = 1276418492. Its totient is φ = 1276418490.

The previous prime is 1276418477. The next prime is 1276418551. The reversal of 1276418491 is 1948146721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1276418491 - 2²⁹ = 739547579 is a prime.

It is not a weakly prime, because it can be changed into another prime (1276418471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638209245 + 638209246.

It is an arithmetic number, because the mean of its divisors is an integer number (638209246).

Almost surely, 2^1276418491 is an apocalyptic number.

1276418491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276418491 is an equidigital number, since it uses as much as digits as its factorization.

1276418491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 1276418491 is about 35726.9994681893. Note that the first 3 decimals coincide. The cubic root of 1276418491 is about 1084.7534224155.

The spelling of 1276418491 in words is "one billion, two hundred seventy-six million, four hundred eighteen thousand, four hundred ninety-one".