1115455221 has 12 divisors (see below), whose sum is σ = 1705990572. Its totient is φ = 699893376.

The previous prime is 1115455193. The next prime is 1115455247. The reversal of 1115455221 is 1225545111.

It is a happy number.

1115455221 is a `hidden beast` number, since 111 + 545 + 5 + 2 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 599711121 + 515744100 = 24489^2 + 22710^2 .

It is not a de Polignac number, because 1115455221 - 2⁹ = 1115454709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115455261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3645126 + ... + 3645431.

It is an arithmetic number, because the mean of its divisors is an integer number (142165881).

Almost surely, 2^1115455221 is an apocalyptic number.

It is an amenable number.

1115455221 is a deficient number, since it is larger than the sum of its proper divisors (590535351).

1115455221 is a wasteful number, since it uses less digits than its factorization.

1115455221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7290580 (or 7290577 counting only the distinct ones).

The product of its digits is 2000, while the sum is 27.

The square root of 1115455221 is about 33398.4314152626. The cubic root of 1115455221 is about 1037.0922292833.

The spelling of 1115455221 in words is "one billion, one hundred fifteen million, four hundred fifty-five thousand, two hundred twenty-one".