205145559 has 6 divisors (see below), whose sum is σ = 296321376. Its totient is φ = 136763700.

The previous prime is 205145557. The next prime is 205145573. The reversal of 205145559 is 955541502.

It is not a de Polignac number, because 205145559 - 2¹ = 205145557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205145557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11396967 + ... + 11396984.

It is an arithmetic number, because the mean of its divisors is an integer number (49386896).

Almost surely, 2^205145559 is an apocalyptic number.

205145559 is a deficient number, since it is larger than the sum of its proper divisors (91175817).

205145559 is a wasteful number, since it uses less digits than its factorization.

205145559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22793957 (or 22793954 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The square root of 205145559 is about 14322.9033020544. The cubic root of 205145559 is about 589.7763769974.

The spelling of 205145559 in words is "two hundred five million, one hundred forty-five thousand, five hundred fifty-nine".