1311143136 has 24 divisors (see below), whose sum is σ = 3441750984. Its totient is φ = 437047680.

The previous prime is 1311143101. The next prime is 1311143159. The reversal of 1311143136 is 6313411131.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6828775 + ... + 6828966.

It is an arithmetic number, because the mean of its divisors is an integer number (143406291).

Almost surely, 2^1311143136 is an apocalyptic number.

1311143136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1311143136 is an abundant number, since it is smaller than the sum of its proper divisors (2130607848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311143136 is a wasteful number, since it uses less digits than its factorization.

1311143136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13657754 (or 13657746 counting only the distinct ones).

The product of its digits is 648, while the sum is 24.

The square root of 1311143136 is about 36209.7105207981. The cubic root of 1311143136 is about 1094.5023588899.

Adding to 1311143136 its reverse (6313411131), we get a palindrome (7624554267).

The spelling of 1311143136 in words is "one billion, three hundred eleven million, one hundred forty-three thousand, one hundred thirty-six".