1311051242 has 4 divisors (see below), whose sum is σ = 1966576866. Its totient is φ = 655525620.

The previous prime is 1311051211. The next prime is 1311051251. The reversal of 1311051242 is 2421501131.

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., 730674961 + 580376281 = 27031^2 + 24091^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327762809 + ... + 327762812.

Almost surely, 2^1311051242 is an apocalyptic number.

1311051242 is a deficient number, since it is larger than the sum of its proper divisors (655525624).

1311051242 is an equidigital number, since it uses as much as digits as its factorization.

1311051242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655525623.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1311051242 is about 36208.4415848017. The cubic root of 1311051242 is about 1094.4767881883.

Adding to 1311051242 its reverse (2421501131), we get a palindrome (3732552373).

The spelling of 1311051242 in words is "one billion, three hundred eleven million, fifty-one thousand, two hundred forty-two".