1312131222 has 96 divisors (see below), whose sum is σ = 3108050400. Its totient is φ = 398628864.

The previous prime is 1312131217. The next prime is 1312131257. The reversal of 1312131222 is 2221312131.

1312131222 is a `hidden beast` number, since 1 + 312 + 131 + 222 = 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.

It is a junction number, because it is equal to n+sod(n) for n = 1312131195 and 1312131204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1226904 + ... + 1227972.

It is an arithmetic number, because the mean of its divisors is an integer number (32375525).

Almost surely, 2^1312131222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1312131222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1554025200).

1312131222 is an abundant number, since it is smaller than the sum of its proper divisors (1795919178).

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

1312131222 is a wasteful number, since it uses less digits than its factorization.

1312131222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230 (or 1227 counting only the distinct ones).

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

The square root of 1312131222 is about 36223.3518879741. The cubic root of 1312131222 is about 1094.7772312198. Note that the first 3 decimals are identical.

Adding to 1312131222 its reverse (2221312131), we get a palindrome (3533443353).

The spelling of 1312131222 in words is "one billion, three hundred twelve million, one hundred thirty-one thousand, two hundred twenty-two".