205543172 has 6 divisors (see below), whose sum is σ = 359700558. Its totient is φ = 102771584.

The previous prime is 205543133. The next prime is 205543187. The reversal of 205543172 is 271345502.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 107453956 + 98089216 = 10366^2 + 9904^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25692893 + ... + 25692900.

It is an arithmetic number, because the mean of its divisors is an integer number (59950093).

Almost surely, 2^205543172 is an apocalyptic number.

It is an amenable number.

205543172 is a deficient number, since it is larger than the sum of its proper divisors (154157386).

205543172 is a wasteful number, since it uses less digits than its factorization.

205543172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51385797 (or 51385795 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 205543172 is about 14336.7769041720. The cubic root of 205543172 is about 590.1571658290.

Adding to 205543172 its reverse (271345502), we get a palindrome (476888674).

The spelling of 205543172 in words is "two hundred five million, five hundred forty-three thousand, one hundred seventy-two".