1231313312 has 48 divisors (see below), whose sum is σ = 2489864832. Its totient is φ = 599047680.

The previous prime is 1231313287. The next prime is 1231313323. The reversal of 1231313312 is 2133131321.

It is a super-2 number, since 2×1231313312² = 3032264944616818688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 606443 + ... + 608469.

It is an arithmetic number, because the mean of its divisors is an integer number (51872184).

Almost surely, 2^1231313312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231313312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1244932416).

1231313312 is an abundant number, since it is smaller than the sum of its proper divisors (1258551520).

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

1231313312 is a wasteful number, since it uses less digits than its factorization.

1231313312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2541 (or 2533 counting only the distinct ones).

The product of its digits is 324, while the sum is 20.

The square root of 1231313312 is about 35090.0742660941. The cubic root of 1231313312 is about 1071.8224719016.

Adding to 1231313312 its reverse (2133131321), we get a palindrome (3364444633).

The spelling of 1231313312 in words is "one billion, two hundred thirty-one million, three hundred thirteen thousand, three hundred twelve".