1213225266 has 64 divisors (see below), whose sum is σ = 2749593600. Its totient is φ = 353505600.

The previous prime is 1213225261. The next prime is 1213225267. The reversal of 1213225266 is 6625223121.

It is not an unprimeable number, because it can be changed into a prime (1213225261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 517525 + ... + 519863.

It is an arithmetic number, because the mean of its divisors is an integer number (42962400).

Almost surely, 2^1213225266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213225266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1374796800).

1213225266 is an abundant number, since it is smaller than the sum of its proper divisors (1536368334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213225266 is a wasteful number, since it uses less digits than its factorization.

1213225266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2655.

The product of its digits is 8640, while the sum is 30.

The square root of 1213225266 is about 34831.3833489283. The cubic root of 1213225266 is about 1066.5481876001.

Adding to 1213225266 its reverse (6625223121), we get a palindrome (7838448387).

The spelling of 1213225266 in words is "one billion, two hundred thirteen million, two hundred twenty-five thousand, two hundred sixty-six".