3218641 has 2 divisors, whose sum is σ = 3218642. Its totient is φ = 3218640.

The previous prime is 3218639. The next prime is 3218653. The reversal of 3218641 is 1468123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2876416 + 342225 = 1696^2 + 585^2 .

It is a cyclic number.

It is not a de Polignac number, because 3218641 - 2¹ = 3218639 is a prime.

Together with 3218639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3218041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1609320 + 1609321.

It is an arithmetic number, because the mean of its divisors is an integer number (1609321).

Almost surely, 2^3218641 is an apocalyptic number.

It is an amenable number.

3218641 is a deficient number, since it is larger than the sum of its proper divisors (1).

3218641 is an equidigital number, since it uses as much as digits as its factorization.

3218641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

The square root of 3218641 is about 1794.0571339843. The cubic root of 3218641 is about 147.6468479115.

The spelling of 3218641 in words is "three million, two hundred eighteen thousand, six hundred forty-one".