205854871 has 2 divisors, whose sum is σ = 205854872. Its totient is φ = 205854870.

The previous prime is 205854851. The next prime is 205854881. The reversal of 205854871 is 178458502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205854871 - 2⁷ = 205854743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205854811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102927435 + 102927436.

It is an arithmetic number, because the mean of its divisors is an integer number (102927436).

Almost surely, 2^205854871 is an apocalyptic number.

205854871 is a deficient number, since it is larger than the sum of its proper divisors (1).

205854871 is an equidigital number, since it uses as much as digits as its factorization.

205854871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 89600, while the sum is 40.

The square root of 205854871 is about 14347.6433953455. The cubic root of 205854871 is about 590.4553326968.

The spelling of 205854871 in words is "two hundred five million, eight hundred fifty-four thousand, eight hundred seventy-one".