1123220291 has 2 divisors, whose sum is σ = 1123220292. Its totient is φ = 1123220290.

The previous prime is 1123220281. The next prime is 1123220353. The reversal of 1123220291 is 1920223211.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1123220291 - 2³⁰ = 49478467 is a prime.

It is a super-2 number, since 2×1123220291² = 2523247644228249362, 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 (1123220201) 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, 561610145 + 561610146.

It is an arithmetic number, because the mean of its divisors is an integer number (561610146).

Almost surely, 2^1123220291 is an apocalyptic number.

1123220291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123220291 is an equidigital number, since it uses as much as digits as its factorization.

1123220291 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 1123220291 is about 33514.4788263222. The cubic root of 1123220291 is about 1039.4931859361.

The spelling of 1123220291 in words is "one billion, one hundred twenty-three million, two hundred twenty thousand, two hundred ninety-one".