1123201091 has 4 divisors (see below), whose sum is σ = 1123637184. Its totient is φ = 1122765000.

The previous prime is 1123201063. The next prime is 1123201097. The reversal of 1123201091 is 1901023211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1901023211 = 439 ⋅4330349.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123201091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123201097) 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 in 3 ways as a sum of consecutive naturals, for example, 214160 + ... + 219341.

It is an arithmetic number, because the mean of its divisors is an integer number (280909296).

Almost surely, 2^1123201091 is an apocalyptic number.

1123201091 is a deficient number, since it is larger than the sum of its proper divisors (436093).

1123201091 is an equidigital number, since it uses as much as digits as its factorization.

1123201091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436092.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1123201091 is about 33514.1923817358. The cubic root of 1123201091 is about 1039.4872629712.

The spelling of 1123201091 in words is "one billion, one hundred twenty-three million, two hundred one thousand, ninety-one".