442212209 has 2 divisors, whose sum is σ = 442212210. Its totient is φ = 442212208.

The previous prime is 442212193. The next prime is 442212227. The reversal of 442212209 is 902212244.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 388878400 + 53333809 = 19720^2 + 7303^2 .

It is a cyclic number.

It is not a de Polignac number, because 442212209 - 2⁴ = 442212193 is a prime.

It is not a weakly prime, because it can be changed into another prime (442212709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221106104 + 221106105.

It is an arithmetic number, because the mean of its divisors is an integer number (221106105).

Almost surely, 2^442212209 is an apocalyptic number.

It is an amenable number.

442212209 is a deficient number, since it is larger than the sum of its proper divisors (1).

442212209 is an equidigital number, since it uses as much as digits as its factorization.

442212209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 442212209 is about 21028.8423124051. The cubic root of 442212209 is about 761.8630475394.

The spelling of 442212209 in words is "four hundred forty-two million, two hundred twelve thousand, two hundred nine".