205151211 has 20 divisors (see below), whose sum is σ = 316350144. Its totient is φ = 132354000.

The previous prime is 205151203. The next prime is 205151239. The reversal of 205151211 is 112151502.

It is not a de Polignac number, because 205151211 - 2³ = 205151203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205153211) 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 19 ways as a sum of consecutive naturals, for example, 38340 + ... + 43361.

Almost surely, 2^205151211 is an apocalyptic number.

205151211 is a deficient number, since it is larger than the sum of its proper divisors (111198933).

205151211 is an equidigital number, since it uses as much as digits as its factorization.

205151211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81744 (or 81735 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 205151211 is about 14323.1006070613. The cubic root of 205151211 is about 589.7817932905.

The spelling of 205151211 in words is "two hundred five million, one hundred fifty-one thousand, two hundred eleven".