1231312122 has 48 divisors (see below), whose sum is σ = 2745073032. Its totient is φ = 398597760.

The previous prime is 1231312111. The next prime is 1231312151. The reversal of 1231312122 is 2212131321.

1231312122 is a `hidden beast` number, since 1 + 231 + 312 + 122 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1214592201 + 16719921 = 34851^2 + 4089^2 .

It is a super-2 number, since 2×1231312122² = 3032259083568285768, which contains 22 as substring.

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 = 1231312095 and 1231312104.

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, 438828 + ... + 441624.

Almost surely, 2^1231312122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231312122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1372536516).

1231312122 is an abundant number, since it is smaller than the sum of its proper divisors (1513760910).

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

1231312122 is a wasteful number, since it uses less digits than its factorization.

1231312122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3503 (or 3500 counting only the distinct ones).

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

The square root of 1231312122 is about 35090.0573097281. The cubic root of 1231312122 is about 1071.8221266147.

Adding to 1231312122 its reverse (2212131321), we get a palindrome (3443443443).

The spelling of 1231312122 in words is "one billion, two hundred thirty-one million, three hundred twelve thousand, one hundred twenty-two".