205290081 has 6 divisors (see below), whose sum is σ = 296530130. Its totient is φ = 136860048.

The previous prime is 205290067. The next prime is 205290143. The reversal of 205290081 is 180092502.

205290081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 204947856 + 342225 = 14316^2 + 585^2 .

It is not a de Polignac number, because 205290081 - 2¹¹ = 205288033 is a prime.

It is a super-2 number, since 2×205290081² = 84288034713973122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205290061) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11404996 + ... + 11405013.

Almost surely, 2^205290081 is an apocalyptic number.

It is an amenable number.

205290081 is a deficient number, since it is larger than the sum of its proper divisors (91240049).

205290081 is a wasteful number, since it uses less digits than its factorization.

205290081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22810015 (or 22810012 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 205290081 is about 14327.9475501553. The cubic root of 205290081 is about 589.9148407205.

The spelling of 205290081 in words is "two hundred five million, two hundred ninety thousand, eighty-one".