1311175042 has 4 divisors (see below), whose sum is σ = 1966762566. Its totient is φ = 655587520.

The previous prime is 1311175037. The next prime is 1311175079. The reversal of 1311175042 is 2405711131.

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., 1261599361 + 49575681 = 35519^2 + 7041^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1311174998 and 1311175016.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327793759 + ... + 327793762.

Almost surely, 2^1311175042 is an apocalyptic number.

1311175042 is a deficient number, since it is larger than the sum of its proper divisors (655587524).

1311175042 is an equidigital number, since it uses as much as digits as its factorization.

1311175042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655587523.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 1311175042 is about 36210.1510905437. The cubic root of 1311175042 is about 1094.5112368703.

Adding to 1311175042 its reverse (2405711131), we get a palindrome (3716886173).

The spelling of 1311175042 in words is "one billion, three hundred eleven million, one hundred seventy-five thousand, forty-two".