1311031332 has 120 divisors (see below), whose sum is σ = 3717483000. Its totient is φ = 400495104.

The previous prime is 1311031297. The next prime is 1311031361. The reversal of 1311031332 is 2331301131.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 49787136 + 1261244196 = 7056^2 + 35514^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 626544 + ... + 628632.

It is an arithmetic number, because the mean of its divisors is an integer number (30979025).

Almost surely, 2^1311031332 is an apocalyptic number.

1311031332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311031332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1858741500).

1311031332 is an abundant number, since it is smaller than the sum of its proper divisors (2406451668).

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

1311031332 is a wasteful number, since it uses less digits than its factorization.

1311031332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2267 (or 2256 counting only the distinct ones).

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

The square root of 1311031332 is about 36208.1666478710. The cubic root of 1311031332 is about 1094.4712478142.

Adding to 1311031332 its reverse (2331301131), we get a palindrome (3642332463).

The spelling of 1311031332 in words is "one billion, three hundred eleven million, thirty-one thousand, three hundred thirty-two".