41686621 has 4 divisors (see below), whose sum is σ = 42155100. Its totient is φ = 41218144.

The previous prime is 41686597. The next prime is 41686633. The reversal of 41686621 is 12668614.

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 4305625 + 37380996 = 2075^2 + 6114^2 .

It is a cyclic number.

It is not a de Polignac number, because 41686621 - 2¹⁹ = 41162333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41686681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234106 + ... + 234283.

It is an arithmetic number, because the mean of its divisors is an integer number (10538775).

Almost surely, 2^41686621 is an apocalyptic number.

It is an amenable number.

41686621 is a deficient number, since it is larger than the sum of its proper divisors (468479).

41686621 is an equidigital number, since it uses as much as digits as its factorization.

41686621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468478.

The product of its digits is 13824, while the sum is 34.

The square root of 41686621 is about 6456.5177146818. The cubic root of 41686621 is about 346.7359705911.

The spelling of 41686621 in words is "forty-one million, six hundred eighty-six thousand, six hundred twenty-one".