205439133 has 8 divisors (see below), whose sum is σ = 281322208. Its totient is φ = 133257744.

The previous prime is 205439093. The next prime is 205439147. The reversal of 205439133 is 331934502.

205439133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 205439133 - 2¹⁸ = 205176989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 205439133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205419133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 925291 + ... + 925512.

It is an arithmetic number, because the mean of its divisors is an integer number (35165276).

Almost surely, 2^205439133 is an apocalyptic number.

It is an amenable number.

205439133 is a deficient number, since it is larger than the sum of its proper divisors (75883075).

205439133 is a wasteful number, since it uses less digits than its factorization.

205439133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850843.

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 205439133 is about 14333.1480491900. The cubic root of 205439133 is about 590.0575764935.

The spelling of 205439133 in words is "two hundred five million, four hundred thirty-nine thousand, one hundred thirty-three".