2005521 has 16 divisors (see below), whose sum is σ = 3120000. Its totient is φ = 1145424.

The previous prime is 2005519. The next prime is 2005547. The reversal of 2005521 is 1255002.

It is not a de Polignac number, because 2005521 - 2¹ = 2005519 is a prime.

It is a super-2 number, since 2×2005521² = 8044228962882, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2005521.

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 15 ways as a sum of consecutive naturals, for example, 55 + ... + 2003.

It is an arithmetic number, because the mean of its divisors is an integer number (195000).

2^2005521 is an apocalyptic number.

2005521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2005521 is a deficient number, since it is larger than the sum of its proper divisors (1114479).

2005521 is an equidigital number, since it uses as much as digits as its factorization.

2005521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1973 (or 1959 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 2005521 is about 1416.1641853966. The cubic root of 2005521 is about 126.1079322097.

The spelling of 2005521 in words is "two million, five thousand, five hundred twenty-one".