12171180397 has 2 divisors, whose sum is σ = 12171180398. Its totient is φ = 12171180396.

The previous prime is 12171180383. The next prime is 12171180407. The reversal of 12171180397 is 79308117121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6379057161 + 5792123236 = 79869^2 + 76106^2 .

It is a cyclic number.

It is not a de Polignac number, because 12171180397 - 2¹⁹ = 12170656109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12171180347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6085590198 + 6085590199.

It is an arithmetic number, because the mean of its divisors is an integer number (6085590199).

Almost surely, 2^12171180397 is an apocalyptic number.

It is an amenable number.

12171180397 is a deficient number, since it is larger than the sum of its proper divisors (1).

12171180397 is an equidigital number, since it uses as much as digits as its factorization.

12171180397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 40.

The spelling of 12171180397 in words is "twelve billion, one hundred seventy-one million, one hundred eighty thousand, three hundred ninety-seven".