1311204312 has 96 divisors (see below), whose sum is σ = 3947233680. Its totient is φ = 389825280.

The previous prime is 1311204299. The next prime is 1311204329. The reversal of 1311204312 is 2134021131.

1311204312 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26358 + ... + 57594.

Almost surely, 2^1311204312 is an apocalyptic number.

1311204312 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 1311204312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1973616840).

1311204312 is an abundant number, since it is smaller than the sum of its proper divisors (2636029368).

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

1311204312 is a wasteful number, since it uses less digits than its factorization.

1311204312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31313 (or 31306 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1311204312 is about 36210.5552567204. Note that the first 3 decimals coincide. The cubic root of 1311204312 is about 1094.5193812457.

Adding to 1311204312 its reverse (2134021131), we get a palindrome (3445225443).

The spelling of 1311204312 in words is "one billion, three hundred eleven million, two hundred four thousand, three hundred twelve".