12171158231 has 2 divisors, whose sum is σ = 12171158232. Its totient is φ = 12171158230.

The previous prime is 12171158221. The next prime is 12171158249. The reversal of 12171158231 is 13285117121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12171158231 is a prime.

It is a super-2 number, since 2×12171158231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12171158221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6085579115 + 6085579116.

It is an arithmetic number, because the mean of its divisors is an integer number (6085579116).

Almost surely, 2^12171158231 is an apocalyptic number.

12171158231 is a deficient number, since it is larger than the sum of its proper divisors (1).

12171158231 is an equidigital number, since it uses as much as digits as its factorization.

12171158231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 32.

The spelling of 12171158231 in words is "twelve billion, one hundred seventy-one million, one hundred fifty-eight thousand, two hundred thirty-one".