1311243242 has 4 divisors (see below), whose sum is σ = 1966864866. Its totient is φ = 655621620.

The previous prime is 1311243217. The next prime is 1311243277. The reversal of 1311243242 is 2423421131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 987279241 + 323964001 = 31421^2 + 17999^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327810809 + ... + 327810812.

Almost surely, 2^1311243242 is an apocalyptic number.

1311243242 is a deficient number, since it is larger than the sum of its proper divisors (655621624).

1311243242 is an equidigital number, since it uses as much as digits as its factorization.

1311243242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655621623.

The product of its digits is 1152, while the sum is 23.

The square root of 1311243242 is about 36211.0928031729. The cubic root of 1311243242 is about 1094.5302133277.

Adding to 1311243242 its reverse (2423421131), we get a palindrome (3734664373).

The spelling of 1311243242 in words is "one billion, three hundred eleven million, two hundred forty-three thousand, two hundred forty-two".