2228581 has 8 divisors (see below), whose sum is σ = 2372760. Its totient is φ = 2085888.

The previous prime is 2228573. The next prime is 2228591. The reversal of 2228581 is 1858222.

It can be written as a sum of positive squares in 4 ways, for example, as 172225 + 2056356 = 415^2 + 1434^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2228581 - 2³ = 2228573 is a prime.

It is a super-2 number, since 2×2228581² = 9933146547122, 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 (2228521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5535 + ... + 5923.

It is an arithmetic number, because the mean of its divisors is an integer number (296595).

2^2228581 is an apocalyptic number.

It is an amenable number.

2228581 is a deficient number, since it is larger than the sum of its proper divisors (144179).

2228581 is a wasteful number, since it uses less digits than its factorization.

2228581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743.

The product of its digits is 2560, while the sum is 28.

The square root of 2228581 is about 1492.8432603592. The cubic root of 2228581 is about 130.6199383737.

It can be divided in two parts, 22285 and 81, that added together give a triangular number (22366 = T₂₁₁).

The spelling of 2228581 in words is "two million, two hundred twenty-eight thousand, five hundred eighty-one".