201679 has 4 divisors (see below), whose sum is σ = 206640. Its totient is φ = 196720.

The previous prime is 201673. The next prime is 201683. The reversal of 201679 is 976102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 976102 = 2 ⋅488051.

It is a cyclic number.

It is not a de Polignac number, because 201679 - 2⁹ = 201167 is a prime.

201679 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2419 + ... + 2500.

It is an arithmetic number, because the mean of its divisors is an integer number (51660).

2²⁰¹⁶⁷⁹ is an apocalyptic number.

201679 is a deficient number, since it is larger than the sum of its proper divisors (4961).

201679 is an equidigital number, since it uses as much as digits as its factorization.

201679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4960.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 201679 is about 449.0868512883. The cubic root of 201679 is about 58.6435464739.

It can be divided in two parts, 20167 and 9, that multiplied together give a triangular number (181503 = T₆₀₂).

The spelling of 201679 in words is "two hundred one thousand, six hundred seventy-nine".