1123855189 has 2 divisors, whose sum is σ = 1123855190. Its totient is φ = 1123855188.

The previous prime is 1123855169. The next prime is 1123855207. The reversal of 1123855189 is 9815583211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1122920100 + 935089 = 33510^2 + 967^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123855189 - 2²¹ = 1121758037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123855129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561927594 + 561927595.

It is an arithmetic number, because the mean of its divisors is an integer number (561927595).

Almost surely, 2^1123855189 is an apocalyptic number.

It is an amenable number.

1123855189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123855189 is an equidigital number, since it uses as much as digits as its factorization.

1123855189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 43.

The square root of 1123855189 is about 33523.9494839137. The cubic root of 1123855189 is about 1039.6890061861.

The spelling of 1123855189 in words is "one billion, one hundred twenty-three million, eight hundred fifty-five thousand, one hundred eighty-nine".