12171643 has 8 divisors (see below), whose sum is σ = 14059440. Its totient is φ = 10414080.

The previous prime is 12171617. The next prime is 12171659. The reversal of 12171643 is 34617121.

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 12171643 - 2¹⁷ = 12040571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12171673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32358 + ... + 32731.

It is an arithmetic number, because the mean of its divisors is an integer number (1757430).

Almost surely, 2^12171643 is an apocalyptic number.

12171643 is a deficient number, since it is larger than the sum of its proper divisors (1887797).

12171643 is a wasteful number, since it uses less digits than its factorization.

12171643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65117.

The product of its digits is 1008, while the sum is 25.

The square root of 12171643 is about 3488.7881850293. The cubic root of 12171643 is about 230.0292527380.

Adding to 12171643 its reverse (34617121), we get a palindrome (46788764).

The spelling of 12171643 in words is "twelve million, one hundred seventy-one thousand, six hundred forty-three".