205512025 has 6 divisors (see below), whose sum is σ = 254834942. Its totient is φ = 164409600.

The previous prime is 205512019. The next prime is 205512077. The reversal of 205512025 is 520215502.

It can be written as a sum of positive squares in 3 ways, for example, as 26594649 + 178917376 = 5157^2 + 13376^2 .

It is not a de Polignac number, because 205512025 - 2⁵ = 205511993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205511987 and 205512005.

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, 4110216 + ... + 4110265.

Almost surely, 2^205512025 is an apocalyptic number.

205512025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

205512025 is a deficient number, since it is larger than the sum of its proper divisors (49322917).

205512025 is an equidigital number, since it uses as much as digits as its factorization.

205512025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8220491 (or 8220486 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 205512025 is about 14335.6906007349. The cubic root of 205512025 is about 590.1273544863.

Adding to 205512025 its reverse (520215502), we get a palindrome (725727527).

The spelling of 205512025 in words is "two hundred five million, five hundred twelve thousand, twenty-five".