1266251113 has 4 divisors (see below), whose sum is σ = 1266670548. Its totient is φ = 1265831680.

The previous prime is 1266251083. The next prime is 1266251123. The reversal of 1266251113 is 3111526621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 974251369 + 291999744 = 31213^2 + 17088^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266251113 - 2¹⁷ = 1266120041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266251123) 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, 205156 + ... + 211237.

It is an arithmetic number, because the mean of its divisors is an integer number (316667637).

Almost surely, 2^1266251113 is an apocalyptic number.

It is an amenable number.

1266251113 is a deficient number, since it is larger than the sum of its proper divisors (419435).

1266251113 is an equidigital number, since it uses as much as digits as its factorization.

1266251113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419434.

The product of its digits is 2160, while the sum is 28.

The square root of 1266251113 is about 35584.4223361853. The cubic root of 1266251113 is about 1081.8655209084.

Adding to 1266251113 its reverse (3111526621), we get a palindrome (4377777734).

The spelling of 1266251113 in words is "one billion, two hundred sixty-six million, two hundred fifty-one thousand, one hundred thirteen".