2265181 has 4 divisors (see below), whose sum is σ = 2272732. Its totient is φ = 2257632.

The previous prime is 2265173. The next prime is 2265223. The reversal of 2265181 is 1815622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1815622 = 2 ⋅907811.

It can be written as a sum of positive squares in 2 ways, for example, as 549081 + 1716100 = 741^2 + 1310^2 .

It is a cyclic number.

It is not a de Polignac number, because 2265181 - 2³ = 2265173 is a prime.

It is a super-2 number, since 2×2265181² = 10262089925522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2265101) 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, 3306 + ... + 3931.

It is an arithmetic number, because the mean of its divisors is an integer number (568183).

2^2265181 is an apocalyptic number.

It is an amenable number.

2265181 is a deficient number, since it is larger than the sum of its proper divisors (7551).

2265181 is an equidigital number, since it uses as much as digits as its factorization.

2265181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7550.

The product of its digits is 960, while the sum is 25.

The square root of 2265181 is about 1505.0518263502. The cubic root of 2265181 is about 131.3311165993.

It can be divided in two parts, 2265 and 181, that multiplied together give a triangular number (409965 = T₉₀₅).

The spelling of 2265181 in words is "two million, two hundred sixty-five thousand, one hundred eighty-one".