123120111 has 16 divisors (see below), whose sum is σ = 166405248. Its totient is φ = 80964000.

The previous prime is 123120091. The next prime is 123120131. The reversal of 123120111 is 111021321.

123120111 = 24² + 25² + ... + 717².

It is an interprime number because it is at equal distance from previous prime (123120091) and next prime (123120131).

It is not a de Polignac number, because 123120111 - 2⁶ = 123120047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123120131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104556 + ... + 105726.

It is an arithmetic number, because the mean of its divisors is an integer number (10400328).

Almost surely, 2^123120111 is an apocalyptic number.

123120111 is a deficient number, since it is larger than the sum of its proper divisors (43285137).

123120111 is a wasteful number, since it uses less digits than its factorization.

123120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1622.

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

The square root of 123120111 is about 11095.9502071702. The cubic root of 123120111 is about 497.4808100137.

Adding to 123120111 its reverse (111021321), we get a palindrome (234141432).

The spelling of 123120111 in words is "one hundred twenty-three million, one hundred twenty thousand, one hundred eleven".