201111123 has 4 divisors (see below), whose sum is σ = 268148168. Its totient is φ = 134074080.

The previous prime is 201111107. The next prime is 201111161. The reversal of 201111123 is 321111102.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 201111123 - 2⁴ = 201111107 is a prime.

It is a super-2 number, since 2×201111123² = 80891367588642258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201111099 and 201111108.

It is not an unprimeable number, because it can be changed into a prime (201111023) 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, 33518518 + ... + 33518523.

It is an arithmetic number, because the mean of its divisors is an integer number (67037042).

Almost surely, 2^201111123 is an apocalyptic number.

201111123 is a deficient number, since it is larger than the sum of its proper divisors (67037045).

201111123 is an equidigital number, since it uses as much as digits as its factorization.

201111123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67037044.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 201111123 is about 14181.3653432947. The cubic root of 201111123 is about 585.8845293881.

Adding to 201111123 its reverse (321111102), we get a palindrome (522222225).

The spelling of 201111123 in words is "two hundred one million, one hundred eleven thousand, one hundred twenty-three".