1266813101 has 4 divisors (see below), whose sum is σ = 1267600092. Its totient is φ = 1266026112.

The previous prime is 1266813083. The next prime is 1266813103. The reversal of 1266813101 is 1013186621.

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 1038772900 + 228040201 = 32230^2 + 15101^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1266813101 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 (1266813103) 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, 391076 + ... + 394301.

It is an arithmetic number, because the mean of its divisors is an integer number (316900023).

Almost surely, 2^1266813101 is an apocalyptic number.

It is an amenable number.

1266813101 is a deficient number, since it is larger than the sum of its proper divisors (786991).

1266813101 is an equidigital number, since it uses as much as digits as its factorization.

1266813101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786990.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1266813101 is about 35592.3180054348. The cubic root of 1266813101 is about 1082.0255485441.

Adding to 1266813101 its reverse (1013186621), we get a palindrome (2279999722).

The spelling of 1266813101 in words is "one billion, two hundred sixty-six million, eight hundred thirteen thousand, one hundred one".