4128581 has 2 divisors, whose sum is σ = 4128582. Its totient is φ = 4128580.

The previous prime is 4128557. The next prime is 4128589. The reversal of 4128581 is 1858214.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3940225 + 188356 = 1985^2 + 434^2 .

It is a cyclic number.

It is not a de Polignac number, because 4128581 - 2⁶ = 4128517 is a prime.

It is a super-2 number, since 2×4128581² = 34090362147122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4128589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2064290 + 2064291.

It is an arithmetic number, because the mean of its divisors is an integer number (2064291).

Almost surely, 2^4128581 is an apocalyptic number.

It is an amenable number.

4128581 is a deficient number, since it is larger than the sum of its proper divisors (1).

4128581 is an equidigital number, since it uses as much as digits as its factorization.

4128581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2560, while the sum is 29.

The square root of 4128581 is about 2031.8909911705. The cubic root of 4128581 is about 160.4231118866.

The spelling of 4128581 in words is "four million, one hundred twenty-eight thousand, five hundred eighty-one".