205531025 has 12 divisors (see below), whose sum is σ = 291267072. Its totient is φ = 140935440.

The previous prime is 205531019. The next prime is 205531049. The reversal of 205531025 is 520135502.

It is a de Polignac number, because none of the positive numbers 2^k-205531025 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 587057 + ... + 587406.

It is an arithmetic number, because the mean of its divisors is an integer number (24272256).

Almost surely, 2^205531025 is an apocalyptic number.

205531025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

205531025 is a deficient number, since it is larger than the sum of its proper divisors (85736047).

205531025 is a wasteful number, since it uses less digits than its factorization.

205531025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174480 (or 1174475 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 205531025 is about 14336.3532671318. The cubic root of 205531025 is about 590.1455400794.

Adding to 205531025 its reverse (520135502), we get a palindrome (725666527).

The spelling of 205531025 in words is "two hundred five million, five hundred thirty-one thousand, twenty-five".