1123120291 has 4 divisors (see below), whose sum is σ = 1171951632. Its totient is φ = 1074288952.

The previous prime is 1123120279. The next prime is 1123120357. The reversal of 1123120291 is 1920213211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1920213211 = 7 ⋅274316173.

It is a cyclic number.

It is not a de Polignac number, because 1123120291 - 2⁵ = 1123120259 is a prime.

It is a super-2 number, since 2×1123120291² = 2522798376111849362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123120231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24415636 + ... + 24415681.

It is an arithmetic number, because the mean of its divisors is an integer number (292987908).

Almost surely, 2^1123120291 is an apocalyptic number.

1123120291 is a deficient number, since it is larger than the sum of its proper divisors (48831341).

1123120291 is an equidigital number, since it uses as much as digits as its factorization.

1123120291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48831340.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1123120291 is about 33512.9869006032. The cubic root of 1123120291 is about 1039.4623364211.

The spelling of 1123120291 in words is "one billion, one hundred twenty-three million, one hundred twenty thousand, two hundred ninety-one".