1266811113 has 4 divisors (see below), whose sum is σ = 1689081488. Its totient is φ = 844540740.

The previous prime is 1266811099. The next prime is 1266811159. The reversal of 1266811113 is 3111186621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3111186621 = 3 ⋅1037062207.

It is not a de Polignac number, because 1266811113 - 2¹⁰ = 1266810089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266881113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211135183 + ... + 211135188.

It is an arithmetic number, because the mean of its divisors is an integer number (422270372).

Almost surely, 2^1266811113 is an apocalyptic number.

It is an amenable number.

1266811113 is a deficient number, since it is larger than the sum of its proper divisors (422270375).

1266811113 is an equidigital number, since it uses as much as digits as its factorization.

1266811113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422270374.

The product of its digits is 1728, while the sum is 30.

The square root of 1266811113 is about 35592.2900780492. The cubic root of 1266811113 is about 1082.0249825390.

Adding to 1266811113 its reverse (3111186621), we get a palindrome (4377997734).

The spelling of 1266811113 in words is "one billion, two hundred sixty-six million, eight hundred eleven thousand, one hundred thirteen".