205143899 has 2 divisors, whose sum is σ = 205143900. Its totient is φ = 205143898.

The previous prime is 205143871. The next prime is 205143901. The reversal of 205143899 is 998341502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205143899 - 2²⁰ = 204095323 is a prime.

Together with 205143901, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205143839) 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 as a sum of consecutive naturals, namely, 102571949 + 102571950.

It is an arithmetic number, because the mean of its divisors is an integer number (102571950).

Almost surely, 2^205143899 is an apocalyptic number.

205143899 is a deficient number, since it is larger than the sum of its proper divisors (1).

205143899 is an equidigital number, since it uses as much as digits as its factorization.

205143899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 205143899 is about 14322.8453527922. The cubic root of 205143899 is about 589.7747862059.

The spelling of 205143899 in words is "two hundred five million, one hundred forty-three thousand, eight hundred ninety-nine".