1311320242 has 4 divisors (see below), whose sum is σ = 1966980366. Its totient is φ = 655660120.

The previous prime is 1311320191. The next prime is 1311320267. The reversal of 1311320242 is 2420231131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2420231131 = 2339 ⋅1034729.

It can be written as a sum of positive squares in only one way, i.e., 1306171881 + 5148361 = 36141^2 + 2269^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 327830059 + ... + 327830062.

Almost surely, 2^1311320242 is an apocalyptic number.

1311320242 is a deficient number, since it is larger than the sum of its proper divisors (655660124).

1311320242 is an equidigital number, since it uses as much as digits as its factorization.

1311320242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655660123.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1311320242 is about 36212.1559976757. The cubic root of 1311320242 is about 1094.5516375695.

Adding to 1311320242 its reverse (2420231131), we get a palindrome (3731551373).

The spelling of 1311320242 in words is "one billion, three hundred eleven million, three hundred twenty thousand, two hundred forty-two".