1266943213 has 16 divisors (see below), whose sum is σ = 1330257600. Its totient is φ = 1205043840.

The previous prime is 1266943189. The next prime is 1266943229. The reversal of 1266943213 is 3123496621.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1266943213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266943243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 853570 + ... + 855052.

It is an arithmetic number, because the mean of its divisors is an integer number (83141100).

Almost surely, 2^1266943213 is an apocalyptic number.

It is an amenable number.

1266943213 is a deficient number, since it is larger than the sum of its proper divisors (63314387).

1266943213 is a wasteful number, since it uses less digits than its factorization.

1266943213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932.

The product of its digits is 46656, while the sum is 37.

The square root of 1266943213 is about 35594.1457686513. The cubic root of 1266943213 is about 1082.0625915482.

The spelling of 1266943213 in words is "one billion, two hundred sixty-six million, nine hundred forty-three thousand, two hundred thirteen".