42209191 has 2 divisors, whose sum is σ = 42209192. Its totient is φ = 42209190.

The previous prime is 42209183. The next prime is 42209207. The reversal of 42209191 is 19190224.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42209191 - 2³ = 42209183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42203191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21104595 + 21104596.

It is an arithmetic number, because the mean of its divisors is an integer number (21104596).

Almost surely, 2^42209191 is an apocalyptic number.

42209191 is a deficient number, since it is larger than the sum of its proper divisors (1).

42209191 is an equidigital number, since it uses as much as digits as its factorization.

42209191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 42209191 is about 6496.8600877655. The cubic root of 42209191 is about 348.1788149376.

The spelling of 42209191 in words is "forty-two million, two hundred nine thousand, one hundred ninety-one".