12105913 has 4 divisors (see below), whose sum is σ = 12144420. Its totient is φ = 12067408.

The previous prime is 12105893. The next prime is 12105917. The reversal of 12105913 is 31950121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31950121 = 7 ⋅4564303.

It can be written as a sum of positive squares in 2 ways, for example, as 896809 + 11209104 = 947^2 + 3348^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12105913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12105917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18778 + ... + 19411.

It is an arithmetic number, because the mean of its divisors is an integer number (3036105).

Almost surely, 2^12105913 is an apocalyptic number.

It is an amenable number.

12105913 is a deficient number, since it is larger than the sum of its proper divisors (38507).

12105913 is an equidigital number, since it uses as much as digits as its factorization.

12105913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38506.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 12105913 is about 3479.3552563658. The cubic root of 12105913 is about 229.6144327692.

The spelling of 12105913 in words is "twelve million, one hundred five thousand, nine hundred thirteen".