4021091 has 2 divisors, whose sum is σ = 4021092. Its totient is φ = 4021090.

The previous prime is 4021081. The next prime is 4021097. The reversal of 4021091 is 1901204.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4021091 - 2¹⁸ = 3758947 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4021097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010545 + 2010546.

It is an arithmetic number, because the mean of its divisors is an integer number (2010546).

Almost surely, 2^4021091 is an apocalyptic number.

4021091 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021091 is an equidigital number, since it uses as much as digits as its factorization.

4021091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 4021091 is about 2005.2658177907. The cubic root of 4021091 is about 159.0186152275.

Adding to 4021091 its reverse (1901204), we get a palindrome (5922295).

The spelling of 4021091 in words is "four million, twenty-one thousand, ninety-one".