1266217093 has 4 divisors (see below), whose sum is σ = 1277422668. Its totient is φ = 1255011520.

The previous prime is 1266217081. The next prime is 1266217097. The reversal of 1266217093 is 3907126621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3907126621 = 79 ⋅49457299.

It can be written as a sum of positive squares in 2 ways, for example, as 13198689 + 1253018404 = 3633^2 + 35398^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266217093 - 2¹⁷ = 1266086021 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 (1266217097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5602618 + ... + 5602843.

It is an arithmetic number, because the mean of its divisors is an integer number (319355667).

Almost surely, 2^1266217093 is an apocalyptic number.

It is an amenable number.

1266217093 is a deficient number, since it is larger than the sum of its proper divisors (11205575).

1266217093 is a wasteful number, since it uses less digits than its factorization.

1266217093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11205574.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 1266217093 is about 35583.9443148170. The cubic root of 1266217093 is about 1081.8558320996.

The spelling of 1266217093 in words is "one billion, two hundred sixty-six million, two hundred seventeen thousand, ninety-three".