123111013 has 16 divisors (see below), whose sum is σ = 134576640. Its totient is φ = 112190400.

The previous prime is 123111011. The next prime is 123111041. The reversal of 123111013 is 310111321.

It is a cyclic number.

It is not a de Polignac number, because 123111013 - 2¹ = 123111011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123110984 and 123111002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123111011) 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, 115503 + ... + 116563.

It is an arithmetic number, because the mean of its divisors is an integer number (8411040).

Almost surely, 2^123111013 is an apocalyptic number.

It is an amenable number.

123111013 is a deficient number, since it is larger than the sum of its proper divisors (11465627).

123111013 is a wasteful number, since it uses less digits than its factorization.

123111013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 123111013 is about 11095.5402302006. The cubic root of 123111013 is about 497.4685558773.

Adding to 123111013 its reverse (310111321), we get a palindrome (433222334).

The spelling of 123111013 in words is "one hundred twenty-three million, one hundred eleven thousand, thirteen".