205194959 has 4 divisors (see below), whose sum is σ = 209066616. Its totient is φ = 201323304.

The previous prime is 205194949. The next prime is 205194971. The reversal of 205194959 is 959491502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205194959 - 2²⁴ = 188417743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205194949) 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, 1935749 + ... + 1935854.

It is an arithmetic number, because the mean of its divisors is an integer number (52266654).

Almost surely, 2^205194959 is an apocalyptic number.

205194959 is a deficient number, since it is larger than the sum of its proper divisors (3871657).

205194959 is an equidigital number, since it uses as much as digits as its factorization.

205194959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3871656.

The product of its (nonzero) digits is 145800, while the sum is 44.

The square root of 205194959 is about 14324.6277089494. The cubic root of 205194959 is about 589.8237134916.

The spelling of 205194959 in words is "two hundred five million, one hundred ninety-four thousand, nine hundred fifty-nine".