1266043287 has 4 divisors (see below), whose sum is σ = 1688057720. Its totient is φ = 844028856.

The previous prime is 1266043279. The next prime is 1266043291. The reversal of 1266043287 is 7823406621.

It is a happy number.

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

It is not a de Polignac number, because 1266043287 - 2³ = 1266043279 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 (1266043187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211007212 + ... + 211007217.

It is an arithmetic number, because the mean of its divisors is an integer number (422014430).

Almost surely, 2^1266043287 is an apocalyptic number.

1266043287 is a deficient number, since it is larger than the sum of its proper divisors (422014433).

1266043287 is an equidigital number, since it uses as much as digits as its factorization.

1266043287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422014432.

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 1266043287 is about 35581.5020340626. The cubic root of 1266043287 is about 1081.8063298882.

The spelling of 1266043287 in words is "one billion, two hundred sixty-six million, forty-three thousand, two hundred eighty-seven".