2251181 has 4 divisors (see below), whose sum is σ = 2260764. Its totient is φ = 2241600.

The previous prime is 2251169. The next prime is 2251199. The reversal of 2251181 is 1811522.

It is a happy number.

2251181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1811522 = 2 ⋅905761.

It can be written as a sum of positive squares in 2 ways, for example, as 1190281 + 1060900 = 1091^2 + 1030^2 .

It is a cyclic number.

It is not a de Polignac number, because 2251181 - 2¹⁴ = 2234797 is a prime.

It is a super-2 number, since 2×2251181² = 10135631789522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2251111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4430 + ... + 4911.

It is an arithmetic number, because the mean of its divisors is an integer number (565191).

2^2251181 is an apocalyptic number.

It is an amenable number.

2251181 is a deficient number, since it is larger than the sum of its proper divisors (9583).

2251181 is an equidigital number, since it uses as much as digits as its factorization.

2251181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9582.

The product of its digits is 160, while the sum is 20.

The square root of 2251181 is about 1500.3936150224. The cubic root of 2251181 is about 131.0599923343.

The spelling of 2251181 in words is "two million, two hundred fifty-one thousand, one hundred eighty-one".