4042091 has 2 divisors, whose sum is σ = 4042092. Its totient is φ = 4042090.

The previous prime is 4042081. The next prime is 4042097. The reversal of 4042091 is 1902404.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4042091 is a prime.

It is not a weakly prime, because it can be changed into another prime (4042097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2021045 + 2021046.

It is an arithmetic number, because the mean of its divisors is an integer number (2021046).

Almost surely, 2^4042091 is an apocalyptic number.

4042091 is a deficient number, since it is larger than the sum of its proper divisors (1).

4042091 is an equidigital number, since it uses as much as digits as its factorization.

4042091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 4042091 is about 2010.4952126280. The cubic root of 4042091 is about 159.2949576800.

Adding to 4042091 its reverse (1902404), we get a palindrome (5944495).

The spelling of 4042091 in words is "four million, forty-two thousand, ninety-one".