1121256166 has 4 divisors (see below), whose sum is σ = 1681884252. Its totient is φ = 560628082.

The previous prime is 1121256161. The next prime is 1121256167. The reversal of 1121256166 is 6616521211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6616521211 = 101 ⋅65510111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121256161) 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 as a sum of consecutive naturals, namely, 280314040 + ... + 280314043.

It is an arithmetic number, because the mean of its divisors is an integer number (420471063).

Almost surely, 2^1121256166 is an apocalyptic number.

1121256166 is a deficient number, since it is larger than the sum of its proper divisors (560628086).

1121256166 is an equidigital number, since it uses as much as digits as its factorization.

1121256166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560628085.

The product of its digits is 4320, while the sum is 31.

The square root of 1121256166 is about 33485.1633712604. The cubic root of 1121256166 is about 1038.8869273654.

Adding to 1121256166 its reverse (6616521211), we get a palindrome (7737777377).

The spelling of 1121256166 in words is "one billion, one hundred twenty-one million, two hundred fifty-six thousand, one hundred sixty-six".