1311533312 has 18 divisors (see below), whose sum is σ = 2617943958. Its totient is φ = 655766528.

The previous prime is 1311533309. The next prime is 1311533317. The reversal of 1311533312 is 2133351131.

It can be written as a sum of positive squares in only one way, i.e., 1257127936 + 54405376 = 35456^2 + 7376^2 .

It is not an unprimeable number, because it can be changed into a prime (1311533317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2561333 + ... + 2561844.

It is an arithmetic number, because the mean of its divisors is an integer number (145441331).

Almost surely, 2^1311533312 is an apocalyptic number.

It is an amenable number.

1311533312 is a deficient number, since it is larger than the sum of its proper divisors (1306410646).

1311533312 is an frugal number, since it uses more digits than its factorization.

1311533312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5123193 (or 5123179 counting only the distinct ones).

The product of its digits is 810, while the sum is 23.

The square root of 1311533312 is about 36215.0978460641. The cubic root of 1311533312 is about 1094.6109171362.

Adding to 1311533312 its reverse (2133351131), we get a palindrome (3444884443).

The spelling of 1311533312 in words is "one billion, three hundred eleven million, five hundred thirty-three thousand, three hundred twelve".