12171131 has 4 divisors (see below), whose sum is σ = 13909872. Its totient is φ = 10432392.

The previous prime is 12171119. The next prime is 12171149. The reversal of 12171131 is 13117121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12171131 - 2⁶ = 12171067 is a prime.

It is a super-2 number, since 2×12171131² = 296272859638322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12171101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 869360 + ... + 869373.

It is an arithmetic number, because the mean of its divisors is an integer number (3477468).

Almost surely, 2^12171131 is an apocalyptic number.

12171131 is a deficient number, since it is larger than the sum of its proper divisors (1738741).

12171131 is an equidigital number, since it uses as much as digits as its factorization.

12171131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738740.

The product of its digits is 42, while the sum is 17.

The square root of 12171131 is about 3488.7148063434. The cubic root of 12171131 is about 230.0260273003.

Adding to 12171131 its reverse (13117121), we get a palindrome (25288252).

The spelling of 12171131 in words is "twelve million, one hundred seventy-one thousand, one hundred thirty-one".