2245 has 4 divisors (see below), whose sum is σ = 2700. Its totient is φ = 1792.

The previous prime is 2243. The next prime is 2251. The reversal of 2245 is 5422.

2245 = T₁₆ + T₁₇ + ... + T₂₅.

2245 = 33² + 34².

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5422 = 2 ⋅2711.

It can be written as a sum of positive squares in 2 ways, for example, as 1089 + 1156 = 33^2 + 34^2 .

It is a cyclic number.

It is not a de Polignac number, because 2245 - 2¹ = 2243 is a prime.

It is a d-powerful number, because it can be written as 2⁷ + 4³ + 2¹¹ + 5 .

It is a plaindrome in base 10.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220 + ... + 229.

It is an arithmetic number, because the mean of its divisors is an integer number (675).

2²²⁴⁵ is an apocalyptic number.

2245 is the 34-th centered square number.

It is an amenable number.

2245 is a deficient number, since it is larger than the sum of its proper divisors (455).

2245 is an equidigital number, since it uses as much as digits as its factorization.

2245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454.

The product of its digits is 80, while the sum is 13.

The square root of 2245 is about 47.3814309619. The cubic root of 2245 is about 13.0939933226.

Adding to 2245 its reverse (5422), we get a palindrome (7667).

It can be divided in two parts, 22 and 45, that multiplied together give a triangular number (990 = T₄₄).

The spelling of 2245 in words is "two thousand, two hundred forty-five".