1211223313 has 2 divisors, whose sum is σ = 1211223314. Its totient is φ = 1211223312.

The previous prime is 1211223287. The next prime is 1211223317. The reversal of 1211223313 is 3133221121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1199444689 + 11778624 = 34633^2 + 3432^2 .

It is an emirp because it is prime and its reverse (3133221121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211223313 - 2⁵ = 1211223281 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211223317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605611656 + 605611657.

It is an arithmetic number, because the mean of its divisors is an integer number (605611657).

Almost surely, 2^1211223313 is an apocalyptic number.

It is an amenable number.

1211223313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211223313 is an equidigital number, since it uses as much as digits as its factorization.

1211223313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 19.

The square root of 1211223313 is about 34802.6337078101. The cubic root of 1211223313 is about 1065.9612246490.

Adding to 1211223313 its reverse (3133221121), we get a palindrome (4344444434).

The spelling of 1211223313 in words is "one billion, two hundred eleven million, two hundred twenty-three thousand, three hundred thirteen".