3128641 has 2 divisors, whose sum is σ = 3128642. Its totient is φ = 3128640.

The previous prime is 3128633. The next prime is 3128647. The reversal of 3128641 is 1468213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2792241 + 336400 = 1671^2 + 580^2 .

It is an emirp because it is prime and its reverse (1468213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3128641 - 2³ = 3128633 is a prime.

It is not a weakly prime, because it can be changed into another prime (3128647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1564320 + 1564321.

It is an arithmetic number, because the mean of its divisors is an integer number (1564321).

Almost surely, 2^3128641 is an apocalyptic number.

It is an amenable number.

3128641 is a deficient number, since it is larger than the sum of its proper divisors (1).

3128641 is an equidigital number, since it uses as much as digits as its factorization.

3128641 is an odious number, because the sum of its binary digits is odd.

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

The square root of 3128641 is about 1768.7964834881. The cubic root of 3128641 is about 146.2576453986.

The spelling of 3128641 in words is "three million, one hundred twenty-eight thousand, six hundred forty-one".