1311533512 has 8 divisors (see below), whose sum is σ = 2459125350. Its totient is φ = 655766752.

The previous prime is 1311533507. The next prime is 1311533519. The reversal of 1311533512 is 2153351131.

It can be written as a sum of positive squares in only one way, i.e., 1188456676 + 123076836 = 34474^2 + 11094^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1311533519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81970837 + ... + 81970852.

Almost surely, 2^1311533512 is an apocalyptic number.

It is an amenable number.

1311533512 is a deficient number, since it is larger than the sum of its proper divisors (1147591838).

1311533512 is a wasteful number, since it uses less digits than its factorization.

1311533512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163941695 (or 163941691 counting only the distinct ones).

The product of its digits is 1350, while the sum is 25.

The square root of 1311533512 is about 36215.1006073433. The cubic root of 1311533512 is about 1094.6109727764.

Adding to 1311533512 its reverse (2153351131), we get a palindrome (3464884643).

The spelling of 1311533512 in words is "one billion, three hundred eleven million, five hundred thirty-three thousand, five hundred twelve".