201715 has 4 divisors (see below), whose sum is σ = 242064. Its totient is φ = 161368.

The previous prime is 201709. The next prime is 201731. The reversal of 201715 is 517102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 517102 = 2 ⋅258551.

It is a cyclic number.

It is not a de Polignac number, because 201715 - 2⁵ = 201683 is a prime.

It is a Duffinian number.

201715 is a lucky number.

It is an unprimeable number.

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, 20167 + ... + 20176.

It is an arithmetic number, because the mean of its divisors is an integer number (60516).

2²⁰¹⁷¹⁵ is an apocalyptic number.

201715 is a deficient number, since it is larger than the sum of its proper divisors (40349).

201715 is an equidigital number, since it uses as much as digits as its factorization.

201715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40348.

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 201715 is about 449.1269308336. The cubic root of 201715 is about 58.6470355863.

Adding to 201715 its reverse (517102), we get a palindrome (718817).

The spelling of 201715 in words is "two hundred one thousand, seven hundred fifteen".