3671221 has 2 divisors, whose sum is σ = 3671222. Its totient is φ = 3671220.

The previous prime is 3671219. The next prime is 3671231. The reversal of 3671221 is 1221763.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3294225 + 376996 = 1815^2 + 614^2 .

It is a cyclic number.

It is not a de Polignac number, because 3671221 - 2¹ = 3671219 is a prime.

Together with 3671219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 3671192 and 3671201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3671231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1835610 + 1835611.

It is an arithmetic number, because the mean of its divisors is an integer number (1835611).

Almost surely, 2^3671221 is an apocalyptic number.

It is an amenable number.

3671221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3671221 is an equidigital number, since it uses as much as digits as its factorization.

3671221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 22.

The square root of 3671221 is about 1916.0430579713. The cubic root of 3671221 is about 154.2659849274.

Adding to 3671221 its reverse (1221763), we get a palindrome (4892984).

The spelling of 3671221 in words is "three million, six hundred seventy-one thousand, two hundred twenty-one".