205243225 has 36 divisors (see below), whose sum is σ = 294547120. Its totient is φ = 141372000.

The previous prime is 205243169. The next prime is 205243273. The reversal of 205243225 is 522342502.

It is a happy number.

It is not a de Polignac number, because 205243225 - 2⁷ = 205243097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 205243225.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 55690 + ... + 59260.

Almost surely, 2^205243225 is an apocalyptic number.

205243225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

205243225 is a deficient number, since it is larger than the sum of its proper divisors (89303895).

205243225 is a wasteful number, since it uses less digits than its factorization.

205243225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622 (or 3606 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 205243225 is about 14326.3123308128. The cubic root of 205243225 is about 589.8699560174.

Adding to 205243225 its reverse (522342502), we get a palindrome (727585727).

The spelling of 205243225 in words is "two hundred five million, two hundred forty-three thousand, two hundred twenty-five".