205494981 has 8 divisors (see below), whose sum is σ = 274168224. Its totient is φ = 136909200.

The previous prime is 205494977. The next prime is 205494983. The reversal of 205494981 is 189494502.

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

It is not a de Polignac number, because 205494981 - 2² = 205494977 is a prime.

It is a super-2 number, since 2×205494981² = 84456374432380722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205494983) 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, 16170 + ... + 25931.

It is an arithmetic number, because the mean of its divisors is an integer number (34271028).

Almost surely, 2^205494981 is an apocalyptic number.

It is an amenable number.

205494981 is a deficient number, since it is larger than the sum of its proper divisors (68673243).

205494981 is a wasteful number, since it uses less digits than its factorization.

205494981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43731.

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 205494981 is about 14335.0961280349. The cubic root of 205494981 is about 590.1110400983. Note that the first 3 decimals are identical.

The spelling of 205494981 in words is "two hundred five million, four hundred ninety-four thousand, nine hundred eighty-one".