205909427 has 2 divisors, whose sum is σ = 205909428. Its totient is φ = 205909426.

The previous prime is 205909411. The next prime is 205909439. The reversal of 205909427 is 724909502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205909427 - 2⁴ = 205909411 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205909447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102954713 + 102954714.

It is an arithmetic number, because the mean of its divisors is an integer number (102954714).

Almost surely, 2^205909427 is an apocalyptic number.

205909427 is a deficient number, since it is larger than the sum of its proper divisors (1).

205909427 is an equidigital number, since it uses as much as digits as its factorization.

205909427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 205909427 is about 14349.5444875438. The cubic root of 205909427 is about 590.5074892407.

The spelling of 205909427 in words is "two hundred five million, nine hundred nine thousand, four hundred twenty-seven".