12135817 has 4 divisors (see below), whose sum is σ = 12306816. Its totient is φ = 11964820.

The previous prime is 12135803. The next prime is 12135821. The reversal of 12135817 is 71853121.

12135817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12135817 - 2⁷ = 12135689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12135017) 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, 85393 + ... + 85534.

It is an arithmetic number, because the mean of its divisors is an integer number (3076704).

Almost surely, 2^12135817 is an apocalyptic number.

It is an amenable number.

12135817 is a deficient number, since it is larger than the sum of its proper divisors (170999).

12135817 is an equidigital number, since it uses as much as digits as its factorization.

12135817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170998.

The product of its digits is 1680, while the sum is 28.

The square root of 12135817 is about 3483.6499537123. The cubic root of 12135817 is about 229.8033416648.

Adding to 12135817 its reverse (71853121), we get a palindrome (83988938).

The spelling of 12135817 in words is "twelve million, one hundred thirty-five thousand, eight hundred seventeen".