1131312222 has 48 divisors (see below), whose sum is σ = 2558785632. Its totient is φ = 360884160.

The previous prime is 1131312181. The next prime is 1131312229. The reversal of 1131312222 is 2222131311.

1131312222 is a `hidden beast` number, since 1 + 131 + 312 + 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 = 1131312195 and 1131312204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131312229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26703 + ... + 54549.

It is an arithmetic number, because the mean of its divisors is an integer number (53308034).

Almost surely, 2^1131312222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1131312222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1279392816).

1131312222 is an abundant number, since it is smaller than the sum of its proper divisors (1427473410).

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

1131312222 is a wasteful number, since it uses less digits than its factorization.

1131312222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27953 (or 27950 counting only the distinct ones).

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

The square root of 1131312222 is about 33634.9850899328. The cubic root of 1131312222 is about 1041.9834626877.

Adding to 1131312222 its reverse (2222131311), we get a palindrome (3353443533).

The spelling of 1131312222 in words is "one billion, one hundred thirty-one million, three hundred twelve thousand, two hundred twenty-two".