1266191413 has 2 divisors, whose sum is σ = 1266191414. Its totient is φ = 1266191412.

The previous prime is 1266191411. The next prime is 1266191419. The reversal of 1266191413 is 3141916621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1134813969 + 131377444 = 33687^2 + 11462^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266191413 - 2¹ = 1266191411 is a prime.

Together with 1266191411, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266191411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633095706 + 633095707.

It is an arithmetic number, because the mean of its divisors is an integer number (633095707).

Almost surely, 2^1266191413 is an apocalyptic number.

It is an amenable number.

1266191413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266191413 is an equidigital number, since it uses as much as digits as its factorization.

1266191413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 1266191413 is about 35583.5834760919. The cubic root of 1266191413 is about 1081.8485183865.

The spelling of 1266191413 in words is "one billion, two hundred sixty-six million, one hundred ninety-one thousand, four hundred thirteen".