1151221113 has 32 divisors (see below), whose sum is σ = 2063819520. Its totient is φ = 619142400.

The previous prime is 1151221111. The next prime is 1151221121. The reversal of 1151221113 is 3111221511.

It is not a de Polignac number, because 1151221113 - 2¹ = 1151221111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1151221111) 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 31 ways as a sum of consecutive naturals, for example, 175938 + ... + 182363.

It is an arithmetic number, because the mean of its divisors is an integer number (64494360).

Almost surely, 2^1151221113 is an apocalyptic number.

It is an amenable number.

1151221113 is a deficient number, since it is larger than the sum of its proper divisors (912598407).

1151221113 is a wasteful number, since it uses less digits than its factorization.

1151221113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358334 (or 358328 counting only the distinct ones).

The product of its digits is 60, while the sum is 18.

The square root of 1151221113 is about 33929.6494676853. The cubic root of 1151221113 is about 1048.0602473110.

Adding to 1151221113 its reverse (3111221511), we get a palindrome (4262442624).

The spelling of 1151221113 in words is "one billion, one hundred fifty-one million, two hundred twenty-one thousand, one hundred thirteen".