1121266161 has 24 divisors (see below), whose sum is σ = 1730929824. Its totient is φ = 696954240.

The previous prime is 1121266147. The next prime is 1121266163. The reversal of 1121266161 is 1616621211.

1121266161 = 3184² + 3185² + ... + 3290².

1121266161 is a `hidden beast` number, since 1 + 1 + 21 + 26 + 616 + 1 = 666.

It is not a de Polignac number, because 1121266161 - 2¹¹ = 1121264113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1121266163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17875 + ... + 50616.

It is an arithmetic number, because the mean of its divisors is an integer number (72122076).

Almost surely, 2^1121266161 is an apocalyptic number.

It is an amenable number.

1121266161 is a deficient number, since it is larger than the sum of its proper divisors (609663663).

1121266161 is a wasteful number, since it uses less digits than its factorization.

1121266161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68621 (or 68618 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 1121266161 is about 33485.3126161307. The cubic root of 1121266161 is about 1038.8900142734.

Adding to 1121266161 its reverse (1616621211), we get a palindrome (2737887372).

The spelling of 1121266161 in words is "one billion, one hundred twenty-one million, two hundred sixty-six thousand, one hundred sixty-one".