205142254 has 4 divisors (see below), whose sum is σ = 307713384. Its totient is φ = 102571126.

The previous prime is 205142243. The next prime is 205142279. The reversal of 205142254 is 452241502.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51285562 + ... + 51285565.

It is an arithmetic number, because the mean of its divisors is an integer number (76928346).

Almost surely, 2^205142254 is an apocalyptic number.

205142254 is a deficient number, since it is larger than the sum of its proper divisors (102571130).

205142254 is a wasteful number, since it uses less digits than its factorization.

205142254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102571129.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 205142254 is about 14322.7879269366. The cubic root of 205142254 is about 589.7732097806.

Adding to 205142254 its reverse (452241502), we get a palindrome (657383756).

The spelling of 205142254 in words is "two hundred five million, one hundred forty-two thousand, two hundred fifty-four".