41621581 has 4 divisors (see below), whose sum is σ = 42303964. Its totient is φ = 40939200.

The previous prime is 41621557. The next prime is 41621599. The reversal of 41621581 is 18512614.

41621581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 6456681 + 35164900 = 2541^2 + 5930^2 .

It is a cyclic number.

It is not a de Polignac number, because 41621581 - 2¹³ = 41613389 is a prime.

It is a super-2 number, since 2×41621581² = 3464712009879122, 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 (41621521) 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, 341100 + ... + 341221.

It is an arithmetic number, because the mean of its divisors is an integer number (10575991).

Almost surely, 2^41621581 is an apocalyptic number.

It is an amenable number.

41621581 is a deficient number, since it is larger than the sum of its proper divisors (682383).

41621581 is an equidigital number, since it uses as much as digits as its factorization.

41621581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682382.

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

The square root of 41621581 is about 6451.4789777229. The cubic root of 41621581 is about 346.5555494260. Note that the first 4 decimals are identical.

The spelling of 41621581 in words is "forty-one million, six hundred twenty-one thousand, five hundred eighty-one".