1121127729 has 16 divisors (see below), whose sum is σ = 1519257600. Its totient is φ = 735284816.

The previous prime is 1121127719. The next prime is 1121127743. The reversal of 1121127729 is 9277211211.

It is a cyclic number.

It is not a de Polignac number, because 1121127729 - 2⁵ = 1121127697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1121127729.

It is not an unprimeable number, because it can be changed into a prime (1121127719) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 50092 + ... + 68930.

It is an arithmetic number, because the mean of its divisors is an integer number (94953600).

Almost surely, 2^1121127729 is an apocalyptic number.

It is an amenable number.

1121127729 is a deficient number, since it is larger than the sum of its proper divisors (398129871).

1121127729 is a wasteful number, since it uses less digits than its factorization.

1121127729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19164.

The product of its digits is 3528, while the sum is 33.

The square root of 1121127729 is about 33483.2454968153. The cubic root of 1121127729 is about 1038.8472585786.

The spelling of 1121127729 in words is "one billion, one hundred twenty-one million, one hundred twenty-seven thousand, seven hundred twenty-nine".