1311121312 has 24 divisors (see below), whose sum is σ = 2623589892. Its totient is φ = 644812800.

The previous prime is 1311121303. The next prime is 1311121313. The reversal of 1311121312 is 2131211131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 783776016 + 527345296 = 27996^2 + 22964^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (1311121313) 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, 333889 + ... + 337792.

Almost surely, 2^1311121312 is an apocalyptic number.

It is an amenable number.

1311121312 is an abundant number, since it is smaller than the sum of its proper divisors (1312468580).

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

1311121312 is an equidigital number, since it uses as much as digits as its factorization.

1311121312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671752 (or 671744 counting only the distinct ones).

The product of its digits is 36, while the sum is 16.

The square root of 1311121312 is about 36209.4091639176. The cubic root of 1311121312 is about 1094.4962861860.

Adding to 1311121312 its reverse (2131211131), we get a palindrome (3442332443).

The spelling of 1311121312 in words is "one billion, three hundred eleven million, one hundred twenty-one thousand, three hundred twelve".