12145517 has 4 divisors (see below), whose sum is σ = 12161340. Its totient is φ = 12129696.

The previous prime is 12145513. The next prime is 12145537. The reversal of 12145517 is 71554121.

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 9853321 + 2292196 = 3139^2 + 1514^2 .

It is a cyclic number.

It is not a de Polignac number, because 12145517 - 2² = 12145513 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 (12145513) 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, 6698 + ... + 8315.

It is an arithmetic number, because the mean of its divisors is an integer number (3040335).

Almost surely, 2^12145517 is an apocalyptic number.

It is an amenable number.

12145517 is a deficient number, since it is larger than the sum of its proper divisors (15823).

12145517 is an equidigital number, since it uses as much as digits as its factorization.

12145517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15822.

The product of its digits is 1400, while the sum is 26.

The square root of 12145517 is about 3485.0418935789. The cubic root of 12145517 is about 229.8645516293.

Adding to 12145517 its reverse (71554121), we get a palindrome (83699638).

The spelling of 12145517 in words is "twelve million, one hundred forty-five thousand, five hundred seventeen".