205598851 has 4 divisors (see below), whose sum is σ = 212231104. Its totient is φ = 198966600.

The previous prime is 205598839. The next prime is 205598857. The reversal of 205598851 is 158895502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 158895502 = 2 ⋅79447751.

It is a cyclic number.

It is not a de Polignac number, because 205598851 - 2²³ = 197210243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205598798 and 205598807.

It is not an unprimeable number, because it can be changed into a prime (205598857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3316080 + ... + 3316141.

It is an arithmetic number, because the mean of its divisors is an integer number (53057776).

Almost surely, 2^205598851 is an apocalyptic number.

205598851 is a deficient number, since it is larger than the sum of its proper divisors (6632253).

205598851 is an equidigital number, since it uses as much as digits as its factorization.

205598851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6632252.

The product of its (nonzero) digits is 144000, while the sum is 43.

The square root of 205598851 is about 14338.7185968621. The cubic root of 205598851 is about 590.2104496783.

The spelling of 205598851 in words is "two hundred five million, five hundred ninety-eight thousand, eight hundred fifty-one".