2253781 has 4 divisors (see below), whose sum is σ = 2314732. Its totient is φ = 2192832.

The previous prime is 2253773. The next prime is 2253803. The reversal of 2253781 is 1873522.

2253781 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.

It can be written as a sum of positive squares in 2 ways, for example, as 792100 + 1461681 = 890^2 + 1209^2 .

It is a cyclic number.

It is not a de Polignac number, because 2253781 - 2³ = 2253773 is a prime.

It is a super-2 number, since 2×2253781² = 10159057591922, 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 (2253721) 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, 30420 + ... + 30493.

It is an arithmetic number, because the mean of its divisors is an integer number (578683).

2^2253781 is an apocalyptic number.

It is an amenable number.

2253781 is a deficient number, since it is larger than the sum of its proper divisors (60951).

2253781 is an equidigital number, since it uses as much as digits as its factorization.

2253781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60950.

The product of its digits is 3360, while the sum is 28.

The square root of 2253781 is about 1501.2598042977. The cubic root of 2253781 is about 131.1104288058.

The spelling of 2253781 in words is "two million, two hundred fifty-three thousand, seven hundred eighty-one".