205072171 has 4 divisors (see below), whose sum is σ = 205268344. Its totient is φ = 204876000.

The previous prime is 205072151. The next prime is 205072177. The reversal of 205072171 is 171270502.

It is a happy number.

205072171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 205072171 - 2¹⁵ = 205039403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205072177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96510 + ... + 98611.

It is an arithmetic number, because the mean of its divisors is an integer number (51317086).

Almost surely, 2^205072171 is an apocalyptic number.

205072171 is a deficient number, since it is larger than the sum of its proper divisors (196173).

205072171 is a wasteful number, since it uses less digits than its factorization.

205072171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196172.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 205072171 is about 14320.3411621372. The cubic root of 205072171 is about 589.7060404824.

The spelling of 205072171 in words is "two hundred five million, seventy-two thousand, one hundred seventy-one".