1311031233 has 6 divisors (see below), whose sum is σ = 1893711794. Its totient is φ = 874020816.

The previous prime is 1311031229. The next prime is 1311031243. The reversal of 1311031233 is 3321301131.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1257624369 + 53406864 = 35463^2 + 7308^2 .

It is not a de Polignac number, because 1311031233 - 2² = 1311031229 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311031213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72835060 + ... + 72835077.

Almost surely, 2^1311031233 is an apocalyptic number.

It is an amenable number.

1311031233 is a deficient number, since it is larger than the sum of its proper divisors (582680561).

1311031233 is a wasteful number, since it uses less digits than its factorization.

1311031233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145670143 (or 145670140 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 1311031233 is about 36208.1652807761. The cubic root of 1311031233 is about 1094.4712202652.

Adding to 1311031233 its reverse (3321301131), we get a palindrome (4632332364).

The spelling of 1311031233 in words is "one billion, three hundred eleven million, thirty-one thousand, two hundred thirty-three".