4005091 has 2 divisors, whose sum is σ = 4005092. Its totient is φ = 4005090.

The previous prime is 4005049. The next prime is 4005119. The reversal of 4005091 is 1905004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4005091 - 2⁹ = 4004579 is a prime.

It is not a weakly prime, because it can be changed into another prime (4005691) 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 as a sum of consecutive naturals, namely, 2002545 + 2002546.

It is an arithmetic number, because the mean of its divisors is an integer number (2002546).

Almost surely, 2^4005091 is an apocalyptic number.

4005091 is a deficient number, since it is larger than the sum of its proper divisors (1).

4005091 is an equidigital number, since it uses as much as digits as its factorization.

4005091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 4005091 is about 2001.2723452844. The cubic root of 4005091 is about 158.8074221353.

The spelling of 4005091 in words is "four million, five thousand, ninety-one".