41091991 has 4 divisors (see below), whose sum is σ = 41105232. Its totient is φ = 41078752.

The previous prime is 41091977. The next prime is 41091997. The reversal of 41091991 is 19919014.

It is a happy number.

41091991 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, 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 41091991 - 2⁷ = 41091863 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 (41091997) 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, 831 + ... + 9103.

It is an arithmetic number, because the mean of its divisors is an integer number (10276308).

Almost surely, 2^41091991 is an apocalyptic number.

41091991 is a deficient number, since it is larger than the sum of its proper divisors (13241).

41091991 is an equidigital number, since it uses as much as digits as its factorization.

41091991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13240.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 41091991 is about 6410.3035029552. The cubic root of 41091991 is about 345.0794216087.

The spelling of 41091991 in words is "forty-one million, ninety-one thousand, nine hundred ninety-one".