4191091 has 2 divisors, whose sum is σ = 4191092. Its totient is φ = 4191090.

The previous prime is 4191073. The next prime is 4191097. The reversal of 4191091 is 1901914.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4191091 - 2¹⁷ = 4060019 is a prime.

It is not a weakly prime, because it can be changed into another prime (4191097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2095545 + 2095546.

It is an arithmetic number, because the mean of its divisors is an integer number (2095546).

Almost surely, 2^4191091 is an apocalyptic number.

4191091 is a deficient number, since it is larger than the sum of its proper divisors (1).

4191091 is an equidigital number, since it uses as much as digits as its factorization.

4191091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 4191091 is about 2047.2154258895. The cubic root of 4191091 is about 161.2287041964.

The spelling of 4191091 in words is "four million, one hundred ninety-one thousand, ninety-one".