12171571 has 8 divisors (see below), whose sum is σ = 12934080. Its totient is φ = 11421288.

The previous prime is 12171539. The next prime is 12171581. The reversal of 12171571 is 17517121.

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 12171571 - 2⁵ = 12171539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12171581) 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, 961 + ... + 5026.

It is an arithmetic number, because the mean of its divisors is an integer number (1616760).

Almost surely, 2^12171571 is an apocalyptic number.

12171571 is a deficient number, since it is larger than the sum of its proper divisors (762509).

12171571 is a wasteful number, since it uses less digits than its factorization.

12171571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6113.

The product of its digits is 490, while the sum is 25.

The square root of 12171571 is about 3488.7778662449. Note that the first 3 decimals coincide. The cubic root of 12171571 is about 230.0287991663.

Adding to 12171571 its reverse (17517121), we get a palindrome (29688692).

The spelling of 12171571 in words is "twelve million, one hundred seventy-one thousand, five hundred seventy-one".