123113111 has 4 divisors (see below), whose sum is σ = 134305224. Its totient is φ = 111921000.

The previous prime is 123113093. The next prime is 123113131. The reversal of 123113111 is 111311321.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 123113111 - 2¹⁸ = 122850967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123113131) 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, 5596040 + ... + 5596061.

It is an arithmetic number, because the mean of its divisors is an integer number (33576306).

Almost surely, 2^123113111 is an apocalyptic number.

123113111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123113111 is a deficient number, since it is larger than the sum of its proper divisors (11192113).

123113111 is a wasteful number, since it uses less digits than its factorization.

123113111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11192112.

The product of its digits is 18, while the sum is 14.

The square root of 123113111 is about 11095.6347722877. The cubic root of 123113111 is about 497.4713817364.

Adding to 123113111 its reverse (111311321), we get a palindrome (234424432).

The spelling of 123113111 in words is "one hundred twenty-three million, one hundred thirteen thousand, one hundred eleven".