1121638568 has 16 divisors (see below), whose sum is σ = 2175592500. Its totient is φ = 541480576.

The previous prime is 1121638549. The next prime is 1121638579. The reversal of 1121638568 is 8658361211.

It can be written as a sum of positive squares in 2 ways, for example, as 1101045124 + 20593444 = 33182^2 + 4538^2 .

It is a super-3 number, since 3×1121638568³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2417093 + ... + 2417556.

Almost surely, 2^1121638568 is an apocalyptic number.

It is an amenable number.

1121638568 is a deficient number, since it is larger than the sum of its proper divisors (1053953932).

1121638568 is a wasteful number, since it uses less digits than its factorization.

1121638568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4834684 (or 4834680 counting only the distinct ones).

The product of its digits is 69120, while the sum is 41.

The square root of 1121638568 is about 33490.8729059127. The cubic root of 1121638568 is about 1039.0050173245.

Adding to 1121638568 its reverse (8658361211), we get a palindrome (9779999779).

The spelling of 1121638568 in words is "one billion, one hundred twenty-one million, six hundred thirty-eight thousand, five hundred sixty-eight".