205156187 has 12 divisors (see below), whose sum is σ = 218660136. Its totient is φ = 192445440.

The previous prime is 205156183. The next prime is 205156199. The reversal of 205156187 is 781651502.

It is not a de Polignac number, because 205156187 - 2² = 205156183 is a prime.

It is a super-2 number, since 2×205156187² = 84178122128757938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205156183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101012 + ... + 103022.

It is an arithmetic number, because the mean of its divisors is an integer number (18221678).

Almost surely, 2^205156187 is an apocalyptic number.

205156187 is a deficient number, since it is larger than the sum of its proper divisors (13503949).

205156187 is a wasteful number, since it uses less digits than its factorization.

205156187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398 (or 2381 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 35.

The square root of 205156187 is about 14323.2743114136. The cubic root of 205156187 is about 589.7865616928.

The spelling of 205156187 in words is "two hundred five million, one hundred fifty-six thousand, one hundred eighty-seven".