2205521 has 2 divisors, whose sum is σ = 2205522. Its totient is φ = 2205520.

The previous prime is 2205503. The next prime is 2205527. The reversal of 2205521 is 1255022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1918225 + 287296 = 1385^2 + 536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2205521 is a prime.

It is a Chen prime.

It is equal to p₁₆₃₀₄₃ and since 2205521 and 163043 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2205521.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2205527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1102760 + 1102761.

It is an arithmetic number, because the mean of its divisors is an integer number (1102761).

2^2205521 is an apocalyptic number.

It is an amenable number.

2205521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2205521 is an equidigital number, since it uses as much as digits as its factorization.

2205521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 2205521 is about 1485.0996599555. The cubic root of 2205521 is about 130.1678502471.

The spelling of 2205521 in words is "two million, two hundred five thousand, five hundred twenty-one".