12131605 has 8 divisors (see below), whose sum is σ = 14581152. Its totient is φ = 9689808.

The previous prime is 12131573. The next prime is 12131621. The reversal of 12131605 is 50613121.

12131605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12131605 - 2⁵ = 12131573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2394 + ... + 5476.

It is an arithmetic number, because the mean of its divisors is an integer number (1822644).

Almost surely, 2^12131605 is an apocalyptic number.

It is an amenable number.

12131605 is a deficient number, since it is larger than the sum of its proper divisors (2449547).

12131605 is an equidigital number, since it uses as much as digits as its factorization.

12131605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3875.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 12131605 is about 3483.0453628972. The cubic root of 12131605 is about 229.7767525010.

Adding to 12131605 its reverse (50613121), we get a palindrome (62744726).

The spelling of 12131605 in words is "twelve million, one hundred thirty-one thousand, six hundred five".