4105991 has 4 divisors (see below), whose sum is σ = 4111152. Its totient is φ = 4100832.

The previous prime is 4105979. The next prime is 4105999. The reversal of 4105991 is 1995014.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4105991 - 2¹⁰ = 4104967 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 (4105999) 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, 1106 + ... + 3071.

It is an arithmetic number, because the mean of its divisors is an integer number (1027788).

Almost surely, 2^4105991 is an apocalyptic number.

4105991 is a deficient number, since it is larger than the sum of its proper divisors (5161).

4105991 is an equidigital number, since it uses as much as digits as its factorization.

4105991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5160.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 4105991 is about 2026.3245051077. The cubic root of 4105991 is about 160.1299855158.

The spelling of 4105991 in words is "four million, one hundred five thousand, nine hundred ninety-one".