206751 has 4 divisors (see below), whose sum is σ = 275672. Its totient is φ = 137832.

The previous prime is 206749. The next prime is 206779. The reversal of 206751 is 157602.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 206751 - 2¹ = 206749 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 206751.

It is not an unprimeable number, because it can be changed into a prime (206051) 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, 34456 + ... + 34461.

It is an arithmetic number, because the mean of its divisors is an integer number (68918).

2²⁰⁶⁷⁵¹ is an apocalyptic number.

206751 is a deficient number, since it is larger than the sum of its proper divisors (68921).

206751 is an equidigital number, since it uses as much as digits as its factorization.

206751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68920.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 206751 is about 454.6988014059. The cubic root of 206751 is about 59.1310883989.

The spelling of 206751 in words is "two hundred six thousand, seven hundred fifty-one".