1311313212 has 120 divisors (see below), whose sum is σ = 3767998080. Its totient is φ = 394359840.

The previous prime is 1311313183. The next prime is 1311313229. The reversal of 1311313212 is 2123131131.

1311313212 is a `hidden beast` number, since 1 + 311 + 31 + 321 + 2 = 666.

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

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a congruent number.

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, 494073 + ... + 496719.

It is an arithmetic number, because the mean of its divisors is an integer number (31399984).

Almost surely, 2^1311313212 is an apocalyptic number.

1311313212 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 1311313212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1883999040).

1311313212 is an abundant number, since it is smaller than the sum of its proper divisors (2456684868).

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

1311313212 is a wasteful number, since it uses less digits than its factorization.

1311313212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813 (or 2802 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1311313212 is about 36212.0589306932. The cubic root of 1311313212 is about 1094.5496815988.

Adding to 1311313212 its reverse (2123131131), we get a palindrome (3434444343).

The spelling of 1311313212 in words is "one billion, three hundred eleven million, three hundred thirteen thousand, two hundred twelve".