205757121 has 8 divisors (see below), whose sum is σ = 274418944. Its totient is φ = 137133360.

The previous prime is 205757093. The next prime is 205757141. The reversal of 205757121 is 121757502.

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

It is not a de Polignac number, because 205757121 - 2¹¹ = 205755073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205757141) 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, 7395 + ... + 21591.

It is an arithmetic number, because the mean of its divisors is an integer number (34302368).

Almost surely, 2^205757121 is an apocalyptic number.

It is an amenable number.

205757121 is a deficient number, since it is larger than the sum of its proper divisors (68661823).

205757121 is a wasteful number, since it uses less digits than its factorization.

205757121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19031.

The product of its (nonzero) digits is 4900, while the sum is 30.

The square root of 205757121 is about 14344.2365080892. The cubic root of 205757121 is about 590.3618588390.

The spelling of 205757121 in words is "two hundred five million, seven hundred fifty-seven thousand, one hundred twenty-one".