2117523 has 4 divisors (see below), whose sum is σ = 2823368. Its totient is φ = 1411680.

The previous prime is 2117513. The next prime is 2117539. The reversal of 2117523 is 3257112.

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

It is not a de Polignac number, because 2117523 - 2¹⁴ = 2101139 is a prime.

It is a d-powerful number, because it can be written as 2⁹ + 1 + 1 + 7² + 5³ + 2²¹ + 3⁹ .

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2117523.

It is not an unprimeable number, because it can be changed into a prime (2117513) 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, 352918 + ... + 352923.

It is an arithmetic number, because the mean of its divisors is an integer number (705842).

2^2117523 is an apocalyptic number.

2117523 is a deficient number, since it is larger than the sum of its proper divisors (705845).

2117523 is an equidigital number, since it uses as much as digits as its factorization.

2117523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705844.

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

The square root of 2117523 is about 1455.1711239576. The cubic root of 2117523 is about 128.4131143135.

The spelling of 2117523 in words is "two million, one hundred seventeen thousand, five hundred twenty-three".