3641581 has 4 divisors (see below), whose sum is σ = 3675100. Its totient is φ = 3608064.

The previous prime is 3641569. The next prime is 3641591. The reversal of 3641581 is 1851463.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1512900 + 2128681 = 1230^2 + 1459^2 .

It is a cyclic number.

It is not a de Polignac number, because 3641581 - 2⁵ = 3641549 is a prime.

It is a super-2 number, since 2×3641581² = 26522224359122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3641551) 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 in 3 ways as a sum of consecutive naturals, for example, 16596 + ... + 16813.

It is an arithmetic number, because the mean of its divisors is an integer number (918775).

Almost surely, 2^3641581 is an apocalyptic number.

It is an amenable number.

3641581 is a deficient number, since it is larger than the sum of its proper divisors (33519).

3641581 is a wasteful number, since it uses less digits than its factorization.

3641581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33518.

The product of its digits is 2880, while the sum is 28.

The square root of 3641581 is about 1908.2926924348. The cubic root of 3641581 is about 153.8497015656.

The spelling of 3641581 in words is "three million, six hundred forty-one thousand, five hundred eighty-one".