205631156 has 6 divisors (see below), whose sum is σ = 359854530. Its totient is φ = 102815576.

The previous prime is 205631137. The next prime is 205631171. The reversal of 205631156 is 651136502.

It can be written as a sum of positive squares in only one way, i.e., 191822500 + 13808656 = 13850^2 + 3716^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25703891 + ... + 25703898.

It is an arithmetic number, because the mean of its divisors is an integer number (59975755).

Almost surely, 2^205631156 is an apocalyptic number.

It is an amenable number.

205631156 is a deficient number, since it is larger than the sum of its proper divisors (154223374).

205631156 is a wasteful number, since it uses less digits than its factorization.

205631156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51407793 (or 51407791 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 205631156 is about 14339.8450479773. The cubic root of 205631156 is about 590.2413606001.

Adding to 205631156 its reverse (651136502), we get a palindrome (856767658).

The spelling of 205631156 in words is "two hundred five million, six hundred thirty-one thousand, one hundred fifty-six".