1276808831 has 2 divisors, whose sum is σ = 1276808832. Its totient is φ = 1276808830.

The previous prime is 1276808803. The next prime is 1276808843. The reversal of 1276808831 is 1388086721.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1276808831 is a prime.

It is a super-2 number, since 2×1276808831² = 3260481581839173122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1276808801) 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, 638404415 + 638404416.

It is an arithmetic number, because the mean of its divisors is an integer number (638404416).

Almost surely, 2^1276808831 is an apocalyptic number.

1276808831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276808831 is an equidigital number, since it uses as much as digits as its factorization.

1276808831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 1276808831 is about 35732.4618659280. The cubic root of 1276808831 is about 1084.8639868579.

The spelling of 1276808831 in words is "one billion, two hundred seventy-six million, eight hundred eight thousand, eight hundred thirty-one".