123112013 has 4 divisors (see below), whose sum is σ = 123137820. Its totient is φ = 123086208.

The previous prime is 123111979. The next prime is 123112019. The reversal of 123112013 is 310211321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26030404 + 97081609 = 5102^2 + 9853^2 .

It is a cyclic number.

It is not a de Polignac number, because 123112013 - 2¹⁰ = 123110989 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 (123112019) 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, 3428 + ... + 16061.

It is an arithmetic number, because the mean of its divisors is an integer number (30784455).

Almost surely, 2^123112013 is an apocalyptic number.

It is an amenable number.

123112013 is a deficient number, since it is larger than the sum of its proper divisors (25807).

123112013 is an equidigital number, since it uses as much as digits as its factorization.

123112013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25806.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 123112013 is about 11095.5852932597. The cubic root of 123112013 is about 497.4699028113.

Adding to 123112013 its reverse (310211321), we get a palindrome (433323334).

The spelling of 123112013 in words is "one hundred twenty-three million, one hundred twelve thousand, thirteen".