2001523 has 4 divisors (see below), whose sum is σ = 2004408. Its totient is φ = 1998640.

The previous prime is 2001511. The next prime is 2001533. The reversal of 2001523 is 3251002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3251002 = 2 ⋅1625501.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001533) 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, 303 + ... + 2023.

It is an arithmetic number, because the mean of its divisors is an integer number (501102).

2^2001523 is an apocalyptic number.

2001523 is a deficient number, since it is larger than the sum of its proper divisors (2885).

2001523 is a wasteful number, since it uses less digits than its factorization.

2001523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2884.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 2001523 is about 1414.7519217163. The cubic root of 2001523 is about 126.0240778711.

Adding to 2001523 its reverse (3251002), we get a palindrome (5252525).

The spelling of 2001523 in words is "two million, one thousand, five hundred twenty-three".