3128581 has 2 divisors, whose sum is σ = 3128582. Its totient is φ = 3128580.

The previous prime is 3128579. The next prime is 3128599. The reversal of 3128581 is 1858213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2044900 + 1083681 = 1430^2 + 1041^2 .

It is a cyclic number.

It is not a de Polignac number, because 3128581 - 2¹ = 3128579 is a prime.

It is a super-2 number, since 2×3128581² = 19576038147122, which contains 22 as substring.

Together with 3128579, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3128501) 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, 1564290 + 1564291.

It is an arithmetic number, because the mean of its divisors is an integer number (1564291).

Almost surely, 2^3128581 is an apocalyptic number.

It is an amenable number.

3128581 is a deficient number, since it is larger than the sum of its proper divisors (1).

3128581 is an equidigital number, since it uses as much as digits as its factorization.

3128581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 28.

The square root of 3128581 is about 1768.7795227218. The cubic root of 3128581 is about 146.2567104331.

The spelling of 3128581 in words is "three million, one hundred twenty-eight thousand, five hundred eighty-one".