1123040291 has 2 divisors, whose sum is σ = 1123040292. Its totient is φ = 1123040290.

The previous prime is 1123040263. The next prime is 1123040327. The reversal of 1123040291 is 1920403211.

It is a weak prime.

It is an emirp because it is prime and its reverse (1920403211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1123040291 - 2⁶ = 1123040227 is a prime.

It is a super-2 number, since 2×1123040291² = 2522438990418729362, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1123048291) 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, 561520145 + 561520146.

It is an arithmetic number, because the mean of its divisors is an integer number (561520146).

Almost surely, 2^1123040291 is an apocalyptic number.

1123040291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123040291 is an equidigital number, since it uses as much as digits as its factorization.

1123040291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1123040291 is about 33511.7933122058. The cubic root of 1123040291 is about 1039.4376554906.

It can be divided in two parts, 112 and 3040291, that added together give a palindrome (3040403).

The spelling of 1123040291 in words is "one billion, one hundred twenty-three million, forty thousand, two hundred ninety-one".