42208091 has 2 divisors, whose sum is σ = 42208092. Its totient is φ = 42208090.

The previous prime is 42208051. The next prime is 42208097. The reversal of 42208091 is 19080224.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42208091 - 2⁶ = 42208027 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42208091.

It is not a weakly prime, because it can be changed into another prime (42208097) 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, 21104045 + 21104046.

It is an arithmetic number, because the mean of its divisors is an integer number (21104046).

Almost surely, 2^42208091 is an apocalyptic number.

42208091 is a deficient number, since it is larger than the sum of its proper divisors (1).

42208091 is an equidigital number, since it uses as much as digits as its factorization.

42208091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 42208091 is about 6496.7754309349. The cubic root of 42208091 is about 348.1757903197.

The spelling of 42208091 in words is "forty-two million, two hundred eight thousand, ninety-one".