205291025 has 6 divisors (see below), whose sum is σ = 254560902. Its totient is φ = 164232800.

The previous prime is 205291019. The next prime is 205291043. The reversal of 205291025 is 520192502.

205291025 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 3 ways, for example, as 61842496 + 143448529 = 7864^2 + 11977^2 .

It is not a de Polignac number, because 205291025 - 2¹⁸ = 205028881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205290985 and 205291003.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4105796 + ... + 4105845.

It is an arithmetic number, because the mean of its divisors is an integer number (42426817).

Almost surely, 2^205291025 is an apocalyptic number.

205291025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

205291025 is a deficient number, since it is larger than the sum of its proper divisors (49269877).

205291025 is an equidigital number, since it uses as much as digits as its factorization.

205291025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8211651 (or 8211646 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 205291025 is about 14327.9804927282. The cubic root of 205291025 is about 589.9157449349.

The spelling of 205291025 in words is "two hundred five million, two hundred ninety-one thousand, twenty-five".