42266209 has 2 divisors, whose sum is σ = 42266210. Its totient is φ = 42266208.

The previous prime is 42266201. The next prime is 42266219. The reversal of 42266209 is 90266224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38787984 + 3478225 = 6228^2 + 1865^2 .

It is a cyclic number.

It is not a de Polignac number, because 42266209 - 2³ = 42266201 is a prime.

It is not a weakly prime, because it can be changed into another prime (42266201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21133104 + 21133105.

It is an arithmetic number, because the mean of its divisors is an integer number (21133105).

Almost surely, 2^42266209 is an apocalyptic number.

It is an amenable number.

42266209 is a deficient number, since it is larger than the sum of its proper divisors (1).

42266209 is an equidigital number, since it uses as much as digits as its factorization.

42266209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 42266209 is about 6501.2467265902. The cubic root of 42266209 is about 348.3355227281.

The spelling of 42266209 in words is "forty-two million, two hundred sixty-six thousand, two hundred nine".