4085891 has 2 divisors, whose sum is σ = 4085892. Its totient is φ = 4085890.

The previous prime is 4085857. The next prime is 4085923. The reversal of 4085891 is 1985804.

4085891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4085891 - 2⁶ = 4085827 is a prime.

It is not a weakly prime, because it can be changed into another prime (4085791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2042945 + 2042946.

It is an arithmetic number, because the mean of its divisors is an integer number (2042946).

Almost surely, 2^4085891 is an apocalyptic number.

4085891 is a deficient number, since it is larger than the sum of its proper divisors (1).

4085891 is an equidigital number, since it uses as much as digits as its factorization.

4085891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 4085891 is about 2021.3587014679. The cubic root of 4085891 is about 159.8682639607.

It can be divided in two parts, 408 and 5891, that multiplied together give a triangular number (2403528 = T₂₁₉₂).

The spelling of 4085891 in words is "four million, eighty-five thousand, eight hundred ninety-one".