1211266345 has 8 divisors (see below), whose sum is σ = 1503641160. Its totient is φ = 935598720.

The previous prime is 1211266339. The next prime is 1211266349. The reversal of 1211266345 is 5436621121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 328225689 + 883040656 = 18117^2 + 29716^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211266345 - 2¹⁷ = 1211135273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211266349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4176636 + ... + 4176925.

It is an arithmetic number, because the mean of its divisors is an integer number (187955145).

Almost surely, 2^1211266345 is an apocalyptic number.

It is an amenable number.

1211266345 is a deficient number, since it is larger than the sum of its proper divisors (292374815).

1211266345 is an equidigital number, since it uses as much as digits as its factorization.

1211266345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8353595.

The product of its digits is 8640, while the sum is 31.

The square root of 1211266345 is about 34803.2519313928. The cubic root of 1211266345 is about 1065.9738482227.

Adding to 1211266345 its reverse (5436621121), we get a palindrome (6647887466).

The spelling of 1211266345 in words is "one billion, two hundred eleven million, two hundred sixty-six thousand, three hundred forty-five".