205998149 has 8 divisors (see below), whose sum is σ = 236085120. Its totient is φ = 176075856.

The previous prime is 205998137. The next prime is 205998173. The reversal of 205998149 is 941899502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205998149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205998349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38474 + ... + 43499.

It is an arithmetic number, because the mean of its divisors is an integer number (29510640).

Almost surely, 2^205998149 is an apocalyptic number.

It is an amenable number.

205998149 is a deficient number, since it is larger than the sum of its proper divisors (30086971).

205998149 is an equidigital number, since it uses as much as digits as its factorization.

205998149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82339.

The product of its (nonzero) digits is 233280, while the sum is 47.

The square root of 205998149 is about 14352.6356116220. The cubic root of 205998149 is about 590.5922894419.

The spelling of 205998149 in words is "two hundred five million, nine hundred ninety-eight thousand, one hundred forty-nine".