205687000271 has 2 divisors, whose sum is σ = 205687000272. Its totient is φ = 205687000270.

The previous prime is 205687000247. The next prime is 205687000279. The reversal of 205687000271 is 172000786502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205687000271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205687000279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102843500135 + 102843500136.

It is an arithmetic number, because the mean of its divisors is an integer number (102843500136).

Almost surely, 2^205687000271 is an apocalyptic number.

205687000271 is a deficient number, since it is larger than the sum of its proper divisors (1).

205687000271 is an equidigital number, since it uses as much as digits as its factorization.

205687000271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47040, while the sum is 38.

Adding to 205687000271 its reverse (172000786502), we get a palindrome (377687786773).

The spelling of 205687000271 in words is "two hundred five billion, six hundred eighty-seven million, two hundred seventy-one", and thus it is an aban number.