205251243 has 24 divisors (see below), whose sum is σ = 292608000. Its totient is φ = 127938096.

The previous prime is 205251239. The next prime is 205251259. The reversal of 205251243 is 342152502.

It is not a de Polignac number, because 205251243 - 2² = 205251239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205251283) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84358 + ... + 86756.

It is an arithmetic number, because the mean of its divisors is an integer number (12192000).

Almost surely, 2^205251243 is an apocalyptic number.

205251243 is a deficient number, since it is larger than the sum of its proper divisors (87356757).

205251243 is a wasteful number, since it uses less digits than its factorization.

205251243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2519 (or 2500 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 205251243 is about 14326.5921628278. The cubic root of 205251243 is about 589.8776371734.

The spelling of 205251243 in words is "two hundred five million, two hundred fifty-one thousand, two hundred forty-three".