1123123111 has 8 divisors (see below), whose sum is σ = 1233450000. Its totient is φ = 1014167040.

The previous prime is 1123123081. The next prime is 1123123213. The reversal of 1123123111 is 1113213211.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1123123111 - 2⁷ = 1123122983 is a prime.

It is a super-2 number, since 2×1123123111² = 2522811044924636642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123127111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340986 + ... + 344263.

It is an arithmetic number, because the mean of its divisors is an integer number (154181250).

Almost surely, 2^1123123111 is an apocalyptic number.

1123123111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1123123111 is a deficient number, since it is larger than the sum of its proper divisors (110326889).

1123123111 is a wasteful number, since it uses less digits than its factorization.

1123123111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685409.

The product of its digits is 36, while the sum is 16.

The square root of 1123123111 is about 33513.0289738185. The cubic root of 1123123111 is about 1039.4632064025.

Adding to 1123123111 its reverse (1113213211), we get a palindrome (2236336322).

The spelling of 1123123111 in words is "one billion, one hundred twenty-three million, one hundred twenty-three thousand, one hundred eleven".