3251221 has 2 divisors, whose sum is σ = 3251222. Its totient is φ = 3251220.

The previous prime is 3251207. The next prime is 3251231. The reversal of 3251221 is 1221523.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1716100 + 1535121 = 1310^2 + 1239^2 .

It is an emirp because it is prime and its reverse (1221523) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3251221 - 2⁷ = 3251093 is a prime.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 3251195 and 3251204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3251231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1625610 + 1625611.

It is an arithmetic number, because the mean of its divisors is an integer number (1625611).

Almost surely, 2^3251221 is an apocalyptic number.

It is an amenable number.

3251221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3251221 is an equidigital number, since it uses as much as digits as its factorization.

3251221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120, while the sum is 16.

The square root of 3251221 is about 1803.1142504012. The cubic root of 3251221 is about 148.1433508809.

Adding to 3251221 its reverse (1221523), we get a palindrome (4472744).

The spelling of 3251221 in words is "three million, two hundred fifty-one thousand, two hundred twenty-one".