1311222222 has 16 divisors (see below), whose sum is σ = 2913827280. Its totient is φ = 437074056.

The previous prime is 1311222197. The next prime is 1311222233. The reversal of 1311222222 is 2222221131.

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.

1311222222 is a modest number, since divided by 22222 gives 13112 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1311222195 and 1311222204.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12140893 + ... + 12141000.

It is an arithmetic number, because the mean of its divisors is an integer number (182114205).

Almost surely, 2^1311222222 is an apocalyptic number.

1311222222 is an abundant number, since it is smaller than the sum of its proper divisors (1602605058).

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

1311222222 is a wasteful number, since it uses less digits than its factorization.

1311222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24281904 (or 24281898 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 1311222222 is about 36210.8025594573. The cubic root of 1311222222 is about 1094.5243646422.

Adding to 1311222222 its reverse (2222221131), we get a palindrome (3533443353).

The spelling of 1311222222 in words is "one billion, three hundred eleven million, two hundred twenty-two thousand, two hundred twenty-two".