205499971 has 2 divisors, whose sum is σ = 205499972. Its totient is φ = 205499970.

The previous prime is 205499939. The next prime is 205500007. The reversal of 205499971 is 179994502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205499971 - 2⁵ = 205499939 is a prime.

It is not a weakly prime, because it can be changed into another prime (205419971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102749985 + 102749986.

It is an arithmetic number, because the mean of its divisors is an integer number (102749986).

Almost surely, 2^205499971 is an apocalyptic number.

205499971 is a deficient number, since it is larger than the sum of its proper divisors (1).

205499971 is an equidigital number, since it uses as much as digits as its factorization.

205499971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 46.

The square root of 205499971 is about 14335.2701753403. The cubic root of 205499971 is about 590.1158165820.

The spelling of 205499971 in words is "two hundred five million, four hundred ninety-nine thousand, nine hundred seventy-one".