12171147 has 8 divisors (see below), whose sum is σ = 16494480. Its totient is φ = 7980960.

The previous prime is 12171119. The next prime is 12171149. The reversal of 12171147 is 74117121.

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

It is a de Polignac number, because none of the positive numbers 2^k-12171147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12171149) 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, 33072 + ... + 33437.

It is an arithmetic number, because the mean of its divisors is an integer number (2061810).

Almost surely, 2^12171147 is an apocalyptic number.

12171147 is a deficient number, since it is larger than the sum of its proper divisors (4323333).

12171147 is an equidigital number, since it uses as much as digits as its factorization.

12171147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66573.

The product of its digits is 392, while the sum is 24.

The square root of 12171147 is about 3488.7170994507. The cubic root of 12171147 is about 230.0261280966.

Adding to 12171147 its reverse (74117121), we get a palindrome (86288268).

It can be divided in two parts, 1217114 and 7, that added together give a palindrome (1217121).

The spelling of 12171147 in words is "twelve million, one hundred seventy-one thousand, one hundred forty-seven".