1266381043 has 2 divisors, whose sum is σ = 1266381044. Its totient is φ = 1266381042.

The previous prime is 1266381041. The next prime is 1266381047. The reversal of 1266381043 is 3401836621.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1266381043 - 2¹ = 1266381041 is a prime.

Together with 1266381041, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1266381041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633190521 + 633190522.

It is an arithmetic number, because the mean of its divisors is an integer number (633190522).

Almost surely, 2^1266381043 is an apocalyptic number.

1266381043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266381043 is an equidigital number, since it uses as much as digits as its factorization.

1266381043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 1266381043 is about 35586.2479477677. The cubic root of 1266381043 is about 1081.9025230422.

The spelling of 1266381043 in words is "one billion, two hundred sixty-six million, three hundred eighty-one thousand, forty-three".