20168191 has 2 divisors, whose sum is σ = 20168192. Its totient is φ = 20168190.

The previous prime is 20168173. The next prime is 20168209. The reversal of 20168191 is 19186102.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (20168173) and next prime (20168209).

It is a cyclic number.

It is not a de Polignac number, because 20168191 - 2¹¹ = 20166143 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20138191) 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, 10084095 + 10084096.

It is an arithmetic number, because the mean of its divisors is an integer number (10084096).

Almost surely, 2^20168191 is an apocalyptic number.

20168191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20168191 is an equidigital number, since it uses as much as digits as its factorization.

20168191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 20168191 is about 4490.9009118439. The cubic root of 20168191 is about 272.2005396462.

The spelling of 20168191 in words is "twenty million, one hundred sixty-eight thousand, one hundred ninety-one".