1123013209 has 2 divisors, whose sum is σ = 1123013210. Its totient is φ = 1123013208.

The previous prime is 1123013201. The next prime is 1123013219. The reversal of 1123013209 is 9023103211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 902401600 + 220611609 = 30040^2 + 14853^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123013209 - 2³ = 1123013201 is a prime.

It is a super-2 number, since 2×1123013209² = 2522317335176955362, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1123013209.

It is not a weakly prime, because it can be changed into another prime (1123013201) 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, 561506604 + 561506605.

It is an arithmetic number, because the mean of its divisors is an integer number (561506605).

Almost surely, 2^1123013209 is an apocalyptic number.

It is an amenable number.

1123013209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123013209 is an equidigital number, since it uses as much as digits as its factorization.

1123013209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1123013209 is about 33511.3892430618. The cubic root of 1123013209 is about 1039.4293001131.

The spelling of 1123013209 in words is "one billion, one hundred twenty-three million, thirteen thousand, two hundred nine".