1266242347 has 4 divisors (see below), whose sum is σ = 1269013576. Its totient is φ = 1263471120.

The previous prime is 1266242333. The next prime is 1266242357. The reversal of 1266242347 is 7432426621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1266242347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266242317) 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, 1384929 + ... + 1385842.

It is an arithmetic number, because the mean of its divisors is an integer number (317253394).

Almost surely, 2^1266242347 is an apocalyptic number.

1266242347 is a deficient number, since it is larger than the sum of its proper divisors (2771229).

1266242347 is an equidigital number, since it uses as much as digits as its factorization.

1266242347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2771228.

The product of its digits is 96768, while the sum is 37.

The square root of 1266242347 is about 35584.2991640976. The cubic root of 1266242347 is about 1081.8630243906.

Adding to 1266242347 its reverse (7432426621), we get a palindrome (8698668968).

The spelling of 1266242347 in words is "one billion, two hundred sixty-six million, two hundred forty-two thousand, three hundred forty-seven".