205136171 has 2 divisors, whose sum is σ = 205136172. Its totient is φ = 205136170.

The previous prime is 205136167. The next prime is 205136203. The reversal of 205136171 is 171631502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205136171 - 2² = 205136167 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205136171.

It is not a weakly prime, because it can be changed into another prime (705136171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102568085 + 102568086.

It is an arithmetic number, because the mean of its divisors is an integer number (102568086).

Almost surely, 2^205136171 is an apocalyptic number.

205136171 is a deficient number, since it is larger than the sum of its proper divisors (1).

205136171 is an equidigital number, since it uses as much as digits as its factorization.

205136171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 205136171 is about 14322.5755714536. The cubic root of 205136171 is about 589.7673802877.

Adding to 205136171 its reverse (171631502), we get a palindrome (376767673).

The spelling of 205136171 in words is "two hundred five million, one hundred thirty-six thousand, one hundred seventy-one".