2225681 has 2 divisors, whose sum is σ = 2225682. Its totient is φ = 2225680.

The previous prime is 2225659. The next prime is 2225683. The reversal of 2225681 is 1865222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1175056 + 1050625 = 1084^2 + 1025^2 .

It is a cyclic number.

It is not a de Polignac number, because 2225681 - 2¹⁰ = 2224657 is a prime.

It is a super-2 number, since 2×2225681² = 9907311827522, which contains 22 as substring.

Together with 2225683, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2225681.

It is not a weakly prime, because it can be changed into another prime (2225683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1112840 + 1112841.

It is an arithmetic number, because the mean of its divisors is an integer number (1112841).

2^2225681 is an apocalyptic number.

It is an amenable number.

2225681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2225681 is an equidigital number, since it uses as much as digits as its factorization.

2225681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 26.

The square root of 2225681 is about 1491.8716432723. The cubic root of 2225681 is about 130.5632562297.

The spelling of 2225681 in words is "two million, two hundred twenty-five thousand, six hundred eighty-one".