1311243132 has 12 divisors (see below), whose sum is σ = 3059567336. Its totient is φ = 437081040.

The previous prime is 1311243121. The next prime is 1311243139. The reversal of 1311243132 is 2313421131.

It is a tau number, because it is divible by the number of its divisors (12).

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

It is a junction number, because it is equal to n+sod(n) for n = 1311243099 and 1311243108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311243139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54635119 + ... + 54635142.

Almost surely, 2^1311243132 is an apocalyptic number.

1311243132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1311243132 is an abundant number, since it is smaller than the sum of its proper divisors (1748324204).

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

1311243132 is a wasteful number, since it uses less digits than its factorization.

1311243132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109270268 (or 109270266 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

The square root of 1311243132 is about 36211.0912843013. The cubic root of 1311243132 is about 1094.5301827210.

Adding to 1311243132 its reverse (2313421131), we get a palindrome (3624664263).

The spelling of 1311243132 in words is "one billion, three hundred eleven million, two hundred forty-three thousand, one hundred thirty-two".