4091791 has 4 divisors (see below), whose sum is σ = 4463784. Its totient is φ = 3719800.

The previous prime is 4091777. The next prime is 4091797. The reversal of 4091791 is 1971904.

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 4091791 - 2⁷ = 4091663 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 (4091797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185980 + ... + 186001.

It is an arithmetic number, because the mean of its divisors is an integer number (1115946).

Almost surely, 2^4091791 is an apocalyptic number.

4091791 is a deficient number, since it is larger than the sum of its proper divisors (371993).

4091791 is a wasteful number, since it uses less digits than its factorization.

4091791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371992.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 4091791 is about 2022.8175894035. The cubic root of 4091791 is about 159.9451765296.

The spelling of 4091791 in words is "four million, ninety-one thousand, seven hundred ninety-one".