3431221 has 2 divisors, whose sum is σ = 3431222. Its totient is φ = 3431220.

The previous prime is 3431213. The next prime is 3431237. The reversal of 3431221 is 1221343.

It is a happy number.

It is an a-pointer prime, because the next prime (3431237) can be obtained adding 3431221 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3290596 + 140625 = 1814^2 + 375^2 .

It is a cyclic number.

It is not a de Polignac number, because 3431221 - 2³ = 3431213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3431195 and 3431204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3431201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1715610 + 1715611.

It is an arithmetic number, because the mean of its divisors is an integer number (1715611).

Almost surely, 2^3431221 is an apocalyptic number.

It is an amenable number.

3431221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3431221 is an equidigital number, since it uses as much as digits as its factorization.

3431221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 16.

The square root of 3431221 is about 1852.3555274299. The cubic root of 3431221 is about 150.8283211776.

Adding to 3431221 its reverse (1221343), we get a palindrome (4652564).

The spelling of 3431221 in words is "three million, four hundred thirty-one thousand, two hundred twenty-one".