1123221155 has 16 divisors (see below), whose sum is σ = 1558980864. Its totient is φ = 760927200.

The previous prime is 1123221137. The next prime is 1123221163. The reversal of 1123221155 is 5511223211.

It is not a de Polignac number, because 1123221155 - 2⁶ = 1123221091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1123221155.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 190421 + ... + 196230.

It is an arithmetic number, because the mean of its divisors is an integer number (97436304).

Almost surely, 2^1123221155 is an apocalyptic number.

1123221155 is a deficient number, since it is larger than the sum of its proper divisors (435759709).

1123221155 is an equidigital number, since it uses as much as digits as its factorization.

1123221155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386746.

The product of its digits is 600, while the sum is 23.

The square root of 1123221155 is about 33514.4917162710. The cubic root of 1123221155 is about 1039.4934524679.

Adding to 1123221155 its reverse (5511223211), we get a palindrome (6634444366).

The spelling of 1123221155 in words is "one billion, one hundred twenty-three million, two hundred twenty-one thousand, one hundred fifty-five".