3863581 has 2 divisors, whose sum is σ = 3863582. Its totient is φ = 3863580.

The previous prime is 3863569. The next prime is 3863591. The reversal of 3863581 is 1853683.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3767481 + 96100 = 1941^2 + 310^2 .

It is a cyclic number.

It is not a de Polignac number, because 3863581 - 2⁵ = 3863549 is a prime.

It is a super-2 number, since 2×3863581² = 29854516287122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3863501) 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, 1931790 + 1931791.

It is an arithmetic number, because the mean of its divisors is an integer number (1931791).

Almost surely, 2^3863581 is an apocalyptic number.

It is an amenable number.

3863581 is a deficient number, since it is larger than the sum of its proper divisors (1).

3863581 is an equidigital number, since it uses as much as digits as its factorization.

3863581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 3863581 is about 1965.5993996743. The cubic root of 3863581 is about 156.9145951175.

It can be divided in two parts, 3863 and 581, that added together give a palindrome (4444).

The spelling of 3863581 in words is "three million, eight hundred sixty-three thousand, five hundred eighty-one".