206120171 has 4 divisors (see below), whose sum is σ = 209023344. Its totient is φ = 203217000.

The previous prime is 206120143. The next prime is 206120177. The reversal of 206120171 is 171021602.

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 206120171 - 2¹⁴ = 206103787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206120177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1451480 + ... + 1451621.

It is an arithmetic number, because the mean of its divisors is an integer number (52255836).

Almost surely, 2^206120171 is an apocalyptic number.

206120171 is a deficient number, since it is larger than the sum of its proper divisors (2903173).

206120171 is an equidigital number, since it uses as much as digits as its factorization.

206120171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2903172.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 206120171 is about 14356.8858392062. The cubic root of 206120171 is about 590.7088779133.

Adding to 206120171 its reverse (171021602), we get a palindrome (377141773).

The spelling of 206120171 in words is "two hundred six million, one hundred twenty thousand, one hundred seventy-one".