1267980871 has 2 divisors, whose sum is σ = 1267980872. Its totient is φ = 1267980870.

The previous prime is 1267980809. The next prime is 1267980893. The reversal of 1267980871 is 1780897621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1267980871 - 2¹¹ = 1267978823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1267380871) 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, 633990435 + 633990436.

It is an arithmetic number, because the mean of its divisors is an integer number (633990436).

Almost surely, 2^1267980871 is an apocalyptic number.

1267980871 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267980871 is an equidigital number, since it uses as much as digits as its factorization.

1267980871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 49.

The square root of 1267980871 is about 35608.7190305970. The cubic root of 1267980871 is about 1082.3579229926.

The spelling of 1267980871 in words is "one billion, two hundred sixty-seven million, nine hundred eighty thousand, eight hundred seventy-one".