991941 has 8 divisors (see below), whose sum is σ = 1341504. Its totient is φ = 651840.

The previous prime is 991931. The next prime is 991943. The reversal of 991941 is 149199.

991941 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 not a de Polignac number, because 991941 - 2⁵ = 991909 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 991941.

It is not an unprimeable number, because it can be changed into a prime (991943) 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, 2116 + ... + 2541.

It is an arithmetic number, because the mean of its divisors is an integer number (167688).

2⁹⁹¹⁹⁴¹ is an apocalyptic number.

It is an amenable number.

991941 is a deficient number, since it is larger than the sum of its proper divisors (349563).

991941 is a wasteful number, since it uses less digits than its factorization.

991941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4731.

The product of its digits is 2916, while the sum is 33.

The square root of 991941 is about 995.9623486859. The cubic root of 991941 is about 99.7306417796.

The spelling of 991941 in words is "nine hundred ninety-one thousand, nine hundred forty-one".