2277721 has 4 divisors (see below), whose sum is σ = 2283700. Its totient is φ = 2271744.

The previous prime is 2277703. The next prime is 2277727. The reversal of 2277721 is 1277722.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1277722 = 2 ⋅638861.

It can be written as a sum of positive squares in 2 ways, for example, as 1299600 + 978121 = 1140^2 + 989^2 .

It is a cyclic number.

It is not a de Polignac number, because 2277721 - 2¹³ = 2269529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2277721.

It is not an unprimeable number, because it can be changed into a prime (2277727) 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, 2376 + ... + 3193.

It is an arithmetic number, because the mean of its divisors is an integer number (570925).

2^2277721 is an apocalyptic number.

It is an amenable number.

2277721 is a deficient number, since it is larger than the sum of its proper divisors (5979).

2277721 is an equidigital number, since it uses as much as digits as its factorization.

2277721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5978.

The product of its digits is 2744, while the sum is 28.

The square root of 2277721 is about 1509.2120460691. The cubic root of 2277721 is about 131.5730196319.

Subtracting from 2277721 its reverse (1277722), we obtain a palindrome (999999).

The spelling of 2277721 in words is "two million, two hundred seventy-seven thousand, seven hundred twenty-one".