841991 has 8 divisors (see below), whose sum is σ = 879744. Its totient is φ = 804960.

The previous prime is 841987. The next prime is 842003. The reversal of 841991 is 199148.

841991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 841991 - 2² = 841987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 841991.

It is not an unprimeable number, because it can be changed into a prime (841921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4781 + ... + 4953.

It is an arithmetic number, because the mean of its divisors is an integer number (109968).

2⁸⁴¹⁹⁹¹ is an apocalyptic number.

841991 is a deficient number, since it is larger than the sum of its proper divisors (37753).

841991 is a wasteful number, since it uses less digits than its factorization.

841991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361.

The product of its digits is 2592, while the sum is 32.

The square root of 841991 is about 917.6006756754. The cubic root of 841991 is about 94.4283678390.

The spelling of 841991 in words is "eight hundred forty-one thousand, nine hundred ninety-one".