1311262313 has 4 divisors (see below), whose sum is σ = 1311462468. Its totient is φ = 1311062160.

The previous prime is 1311262301. The next prime is 1311262363. The reversal of 1311262313 is 3132621131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3132621131 = 107 ⋅29276833.

It can be written as a sum of positive squares in 2 ways, for example, as 551874064 + 759388249 = 23492^2 + 27557^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311262313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311262363) 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 3 ways as a sum of consecutive naturals, for example, 89906 + ... + 103467.

It is an arithmetic number, because the mean of its divisors is an integer number (327865617).

Almost surely, 2^1311262313 is an apocalyptic number.

It is an amenable number.

1311262313 is a deficient number, since it is larger than the sum of its proper divisors (200155).

1311262313 is an equidigital number, since it uses as much as digits as its factorization.

1311262313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200154.

The product of its digits is 648, while the sum is 23.

The square root of 1311262313 is about 36211.3561331249. The cubic root of 1311262313 is about 1094.5355196619.

Adding to 1311262313 its reverse (3132621131), we get a palindrome (4443883444).

The spelling of 1311262313 in words is "one billion, three hundred eleven million, two hundred sixty-two thousand, three hundred thirteen".