1312211232 has 192 divisors, whose sum is σ = 4153161600. Its totient is φ = 401448960.

The previous prime is 1312211213. The next prime is 1312211239. The reversal of 1312211232 is 2321122131.

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 not an unprimeable number, because it can be changed into a prime (1312211239) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 601119 + ... + 603297.

It is an arithmetic number, because the mean of its divisors is an integer number (21631050).

Almost surely, 2^1312211232 is an apocalyptic number.

1312211232 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 1312211232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2076580800).

1312211232 is an abundant number, since it is smaller than the sum of its proper divisors (2840950368).

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

1312211232 is a wasteful number, since it uses less digits than its factorization.

1312211232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2256 (or 2242 counting only the distinct ones).

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

The square root of 1312211232 is about 36224.4562692113. The cubic root of 1312211232 is about 1094.7994828931.

Adding to 1312211232 its reverse (2321122131), we get a palindrome (3633333363).

The spelling of 1312211232 in words is "one billion, three hundred twelve million, two hundred eleven thousand, two hundred thirty-two".