205131156 has 24 divisors (see below), whose sum is σ = 489771744. Its totient is φ = 66786720.

The previous prime is 205131139. The next prime is 205131167. The reversal of 205131156 is 651131502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198255 + ... + 199286.

It is an arithmetic number, because the mean of its divisors is an integer number (20407156).

Almost surely, 2^205131156 is an apocalyptic number.

It is an amenable number.

205131156 is an abundant number, since it is smaller than the sum of its proper divisors (284640588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205131156 is a wasteful number, since it uses less digits than its factorization.

205131156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397591 (or 397589 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 205131156 is about 14322.4004971234. The cubic root of 205131156 is about 589.7625741997.

Adding to 205131156 its reverse (651131502), we get a palindrome (856262658).

The spelling of 205131156 in words is "two hundred five million, one hundred thirty-one thousand, one hundred fifty-six".