205730561 has 8 divisors (see below), whose sum is σ = 215225664. Its totient is φ = 196281360.

The previous prime is 205730557. The next prime is 205730587. The reversal of 205730561 is 165037502.

205730561 = 58² + 59² + ... + 851².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205730561 - 2² = 205730557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205732561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2135 + ... + 20396.

It is an arithmetic number, because the mean of its divisors is an integer number (26903208).

Almost surely, 2^205730561 is an apocalyptic number.

It is an amenable number.

205730561 is a deficient number, since it is larger than the sum of its proper divisors (9495103).

205730561 is a wasteful number, since it uses less digits than its factorization.

205730561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22951.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 205730561 is about 14343.3106708319. The cubic root of 205730561 is about 590.3364556102.

The spelling of 205730561 in words is "two hundred five million, seven hundred thirty thousand, five hundred sixty-one".