204168191 has 2 divisors, whose sum is σ = 204168192. Its totient is φ = 204168190.

The previous prime is 204168127. The next prime is 204168193. The reversal of 204168191 is 191861402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204168191 - 2⁶ = 204168127 is a prime.

Together with 204168193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204168193) 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, 102084095 + 102084096.

It is an arithmetic number, because the mean of its divisors is an integer number (102084096).

Almost surely, 2^204168191 is an apocalyptic number.

204168191 is a deficient number, since it is larger than the sum of its proper divisors (1).

204168191 is an equidigital number, since it uses as much as digits as its factorization.

204168191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 204168191 is about 14288.7435066909. The cubic root of 204168191 is about 588.8382684479.

The spelling of 204168191 in words is "two hundred four million, one hundred sixty-eight thousand, one hundred ninety-one".