205560251 has 8 divisors (see below), whose sum is σ = 222860400. Its totient is φ = 188472672.

The previous prime is 205560203. The next prime is 205560263. The reversal of 205560251 is 152065502.

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 205560251 - 2¹⁴ = 205543867 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205560251.

It is not an unprimeable number, because it can be changed into a prime (205560151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51125 + ... + 54998.

It is an arithmetic number, because the mean of its divisors is an integer number (27857550).

Almost surely, 2^205560251 is an apocalyptic number.

205560251 is a deficient number, since it is larger than the sum of its proper divisors (17300149).

205560251 is a wasteful number, since it uses less digits than its factorization.

205560251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106285.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 205560251 is about 14337.3725277681. The cubic root of 205560251 is about 590.1735111624.

The spelling of 205560251 in words is "two hundred five million, five hundred sixty thousand, two hundred fifty-one".