2275821 has 6 divisors (see below), whose sum is σ = 3287310. Its totient is φ = 1517208.

The previous prime is 2275813. The next prime is 2275831. The reversal of 2275821 is 1285722.

It can be written as a sum of positive squares in only one way, i.e., 2160900 + 114921 = 1470^2 + 339^2 .

It is not a de Polignac number, because 2275821 - 2³ = 2275813 is a prime.

It is a super-2 number, since 2×2275821² = 10358722448082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2275831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 126426 + ... + 126443.

It is an arithmetic number, because the mean of its divisors is an integer number (547885).

2^2275821 is an apocalyptic number.

It is an amenable number.

2275821 is a deficient number, since it is larger than the sum of its proper divisors (1011489).

2275821 is a wasteful number, since it uses less digits than its factorization.

2275821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252875 (or 252872 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 2275821 is about 1508.5824472000. The cubic root of 2275821 is about 131.5364248250.

Subtracting from 2275821 its reverse (1285722), we obtain a palindrome (990099).

The spelling of 2275821 in words is "two million, two hundred seventy-five thousand, eight hundred twenty-one".