12172571 has 4 divisors (see below), whose sum is σ = 12183072. Its totient is φ = 12162072.

The previous prime is 12172549. The next prime is 12172579. The reversal of 12172571 is 17527121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 17527121 = 31 ⋅565391.

It is a cyclic number.

It is not a de Polignac number, because 12172571 - 2¹⁴ = 12156187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12172571.

It is not an unprimeable number, because it can be changed into a prime (12172579) 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, 3260 + ... + 5913.

It is an arithmetic number, because the mean of its divisors is an integer number (3045768).

Almost surely, 2^12172571 is an apocalyptic number.

12172571 is a deficient number, since it is larger than the sum of its proper divisors (10501).

12172571 is an equidigital number, since it uses as much as digits as its factorization.

12172571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500.

The product of its digits is 980, while the sum is 26.

The square root of 12172571 is about 3488.9211799638. The cubic root of 12172571 is about 230.0350986133.

Adding to 12172571 its reverse (17527121), we get a palindrome (29699692).

The spelling of 12172571 in words is "twelve million, one hundred seventy-two thousand, five hundred seventy-one".