12171801 has 8 divisors (see below), whose sum is σ = 16451680. Its totient is φ = 8003232.

The previous prime is 12171787. The next prime is 12171811. The reversal of 12171801 is 10817121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12171801 - 2⁷ = 12171673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12171811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27571 + ... + 28008.

It is an arithmetic number, because the mean of its divisors is an integer number (2056460).

Almost surely, 2^12171801 is an apocalyptic number.

It is an amenable number.

12171801 is a deficient number, since it is larger than the sum of its proper divisors (4279879).

12171801 is an equidigital number, since it uses as much as digits as its factorization.

12171801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55655.

The product of its (nonzero) digits is 112, while the sum is 21.

The square root of 12171801 is about 3488.8108289215. The cubic root of 12171801 is about 230.0302480697.

Adding to 12171801 its reverse (10817121), we get a palindrome (22988922).

The spelling of 12171801 in words is "twelve million, one hundred seventy-one thousand, eight hundred one".