41991181807 has 4 divisors (see below), whose sum is σ = 41991611536. Its totient is φ = 41990752080.

The previous prime is 41991181783. The next prime is 41991181867. The reversal of 41991181807 is 70818119914.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 41991181807 - 2¹⁹ = 41990657519 is a prime.

It is the 204918-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41991181867) by changing a digit.

It is a nontrivial repunit in base 204917.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10507 + ... + 289987.

It is an arithmetic number, because the mean of its divisors is an integer number (10497902884).

Almost surely, 2^41991181807 is an apocalyptic number.

41991181807 is a deficient number, since it is larger than the sum of its proper divisors (429729).

41991181807 is a wasteful number, since it uses less digits than its factorization.

41991181807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429728.

The product of its (nonzero) digits is 145152, while the sum is 49.

The spelling of 41991181807 in words is "forty-one billion, nine hundred ninety-one million, one hundred eighty-one thousand, eight hundred seven".