206851 has 4 divisors (see below), whose sum is σ = 210304. Its totient is φ = 203400.
The previous prime is 206827. The next prime is 206879. The reversal of 206851 is 158602.
It is a happy number.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 158602 = 2 ⋅79301.
It is a cyclic number.
It is not a de Polignac number, because 206851 - 25 = 206819 is a prime.
It is a Duffinian number.
206851 is a lucky number.
It is a nialpdrome in base 14.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (206821) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1635 + ... + 1756.
It is an arithmetic number, because the mean of its divisors is an integer number (52576).
2206851 is an apocalyptic number.
206851 is a deficient number, since it is larger than the sum of its proper divisors (3453).
206851 is an equidigital number, since it uses as much as digits as its factorization.
206851 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3452.
The product of its (nonzero) digits is 480, while the sum is 22.
The square root of 206851 is about 454.8087510152. The cubic root of 206851 is about 59.1406202444.
The spelling of 206851 in words is "two hundred six thousand, eight hundred fifty-one".
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