1121542209 has 12 divisors (see below), whose sum is σ = 1620982116. Its totient is φ = 747244032.

The previous prime is 1121542193. The next prime is 1121542229. The reversal of 1121542209 is 9022451211.

1121542209 is a `hidden beast` number, since 112 + 1 + 542 + 2 + 0 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 683561025 + 437981184 = 26145^2 + 20928^2 .

It is not a de Polignac number, because 1121542209 - 2⁴ = 1121542193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1121542229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21444 + ... + 51989.

It is an arithmetic number, because the mean of its divisors is an integer number (135081843).

Almost surely, 2^1121542209 is an apocalyptic number.

It is an amenable number.

1121542209 is a deficient number, since it is larger than the sum of its proper divisors (499439907).

1121542209 is a wasteful number, since it uses less digits than its factorization.

1121542209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75136 (or 75133 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1121542209 is about 33489.4342890411. The cubic root of 1121542209 is about 1038.9752631314.

The spelling of 1121542209 in words is "one billion, one hundred twenty-one million, five hundred forty-two thousand, two hundred nine".