205651559 has 2 divisors, whose sum is σ = 205651560. Its totient is φ = 205651558.

The previous prime is 205651519. The next prime is 205651561. The reversal of 205651559 is 955156502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205651559 is a prime.

It is a Sophie Germain prime.

Together with 205651561, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205651519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102825779 + 102825780.

It is an arithmetic number, because the mean of its divisors is an integer number (102825780).

Almost surely, 2^205651559 is an apocalyptic number.

205651559 is a deficient number, since it is larger than the sum of its proper divisors (1).

205651559 is an equidigital number, since it uses as much as digits as its factorization.

205651559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67500, while the sum is 38.

The square root of 205651559 is about 14340.5564396923. The cubic root of 205651559 is about 590.2608814685.

The spelling of 205651559 in words is "two hundred five million, six hundred fifty-one thousand, five hundred fifty-nine".