41686781 has 2 divisors, whose sum is σ = 41686782. Its totient is φ = 41686780.

The previous prime is 41686769. The next prime is 41686783. The reversal of 41686781 is 18768614.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38019556 + 3667225 = 6166^2 + 1915^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-41686781 is a prime.

It is a super-2 number, since 2×41686781² = 3475575420283922, which contains 22 as substring.

Together with 41686783, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_2529797 and since 41686781 and 2529797 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41686783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20843390 + 20843391.

It is an arithmetic number, because the mean of its divisors is an integer number (20843391).

Almost surely, 2^41686781 is an apocalyptic number.

It is an amenable number.

41686781 is a deficient number, since it is larger than the sum of its proper divisors (1).

41686781 is an equidigital number, since it uses as much as digits as its factorization.

41686781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 41.

The square root of 41686781 is about 6456.5301052500. The cubic root of 41686781 is about 346.7364142001.

The spelling of 41686781 in words is "forty-one million, six hundred eighty-six thousand, seven hundred eighty-one".