2005531 has 8 divisors (see below), whose sum is σ = 2283264. Its totient is φ = 1743720.

The previous prime is 2005519. The next prime is 2005547. The reversal of 2005531 is 1355002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2005531 - 2⁵ = 2005499 is a prime.

It is a super-2 number, since 2×2005531² = 8044309183922, which contains 22 as substring.

It is a Duffinian number.

2005531 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3711 + ... + 4216.

It is an arithmetic number, because the mean of its divisors is an integer number (285408).

2^2005531 is an apocalyptic number.

2005531 is a deficient number, since it is larger than the sum of its proper divisors (277733).

2005531 is a wasteful number, since it uses less digits than its factorization.

2005531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7961.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 2005531 is about 1416.1677160563. The cubic root of 2005531 is about 126.1081418106.

The spelling of 2005531 in words is "two million, five thousand, five hundred thirty-one".