1311413221 has 2 divisors, whose sum is σ = 1311413222. Its totient is φ = 1311413220.

The previous prime is 1311413203. The next prime is 1311413261. The reversal of 1311413221 is 1223141131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 787644225 + 523768996 = 28065^2 + 22886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311413221 - 2¹⁷ = 1311282149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311413261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655706610 + 655706611.

It is an arithmetic number, because the mean of its divisors is an integer number (655706611).

Almost surely, 2^1311413221 is an apocalyptic number.

It is an amenable number.

1311413221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311413221 is an equidigital number, since it uses as much as digits as its factorization.

1311413221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 19.

The square root of 1311413221 is about 36213.4397841464. The cubic root of 1311413221 is about 1094.5775066410.

Adding to 1311413221 its reverse (1223141131), we get a palindrome (2534554352).

It can be divided in two parts, 13114 and 13221, that added together give a triangular number (26335 = T₂₂₉).

The spelling of 1311413221 in words is "one billion, three hundred eleven million, four hundred thirteen thousand, two hundred twenty-one".