205091 has 8 divisors (see below), whose sum is σ = 220704. Its totient is φ = 190080.
The previous prime is 205081. The next prime is 205097. The reversal of 205091 is 190502.
205091 is nontrivially palindromic in base 4 and base 16.
205091 is an esthetic number in base 16, because in such base its adjacent digits differ by 1.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 205091 - 210 = 204067 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (205097) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 731 + ... + 971.
It is an arithmetic number, because the mean of its divisors is an integer number (27588).
2205091 is an apocalyptic number.
205091 is a deficient number, since it is larger than the sum of its proper divisors (15613).
205091 is a wasteful number, since it uses less digits than its factorization.
205091 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 301.
The product of its (nonzero) digits is 90, while the sum is 17.
The square root of 205091 is about 452.8697384458. The cubic root of 205091 is about 58.9724088170.
Adding to 205091 its reverse (190502), we get a palindrome (395593).
The spelling of 205091 in words is "two hundred five thousand, ninety-one".
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