1222181564 has 12 divisors (see below), whose sum is σ = 2139580800. Its totient is φ = 610872768.

The previous prime is 1222181551. The next prime is 1222181591. The reversal of 1222181564 is 4651812221.

It is a self number, because there is not a number n which added to its sum of digits gives 1222181564.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41549 + ... + 64580.

It is an arithmetic number, because the mean of its divisors is an integer number (178298400).

Almost surely, 2^1222181564 is an apocalyptic number.

It is an amenable number.

1222181564 is a deficient number, since it is larger than the sum of its proper divisors (917399236).

1222181564 is a wasteful number, since it uses less digits than its factorization.

1222181564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109012 (or 109010 counting only the distinct ones).

The product of its digits is 7680, while the sum is 32.

The square root of 1222181564 is about 34959.7134427615. The cubic root of 1222181564 is about 1069.1662541723.

Adding to 1222181564 its reverse (4651812221), we get a palindrome (5873993785).

The spelling of 1222181564 in words is "one billion, two hundred twenty-two million, one hundred eighty-one thousand, five hundred sixty-four".