3225821 has 2 divisors, whose sum is σ = 3225822. Its totient is φ = 3225820.

The previous prime is 3225793. The next prime is 3225823. The reversal of 3225821 is 1285223.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2788900 + 436921 = 1670^2 + 661^2 .

It is an emirp because it is prime and its reverse (1285223) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3225821 - 2¹⁰ = 3224797 is a prime.

It is a super-2 number, since 2×3225821² = 20811842248082, which contains 22 as substring.

Together with 3225823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3225823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1612910 + 1612911.

It is an arithmetic number, because the mean of its divisors is an integer number (1612911).

Almost surely, 2^3225821 is an apocalyptic number.

It is an amenable number.

3225821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3225821 is an equidigital number, since it uses as much as digits as its factorization.

3225821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 23.

The square root of 3225821 is about 1796.0570703627. The cubic root of 3225821 is about 147.7565543648.

The spelling of 3225821 in words is "three million, two hundred twenty-five thousand, eight hundred twenty-one".