205591994 has 4 divisors (see below), whose sum is σ = 308387994. Its totient is φ = 102795996.

The previous prime is 205591993. The next prime is 205592003. The reversal of 205591994 is 499195502.

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

It can be written as a sum of positive squares in only one way, i.e., 171217225 + 34374769 = 13085^2 + 5863^2 .

It is not an unprimeable number, because it can be changed into a prime (205591993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51397997 + ... + 51398000.

Almost surely, 2^205591994 is an apocalyptic number.

205591994 is a deficient number, since it is larger than the sum of its proper divisors (102796000).

205591994 is a wasteful number, since it uses less digits than its factorization.

205591994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102795999.

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

The square root of 205591994 is about 14338.4794870307. The cubic root of 205591994 is about 590.2038881662.

It can be divided in two parts, 2055 and 91994, that added together give a palindrome (94049).

The spelling of 205591994 in words is "two hundred five million, five hundred ninety-one thousand, nine hundred ninety-four".