34805209 has 2 divisors, whose sum is σ = 34805210. Its totient is φ = 34805208.

The previous prime is 34805203. The next prime is 34805257. The reversal of 34805209 is 90250843.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34257609 + 547600 = 5853^2 + 740^2 .

It is an emirp because it is prime and its reverse (90250843) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 34805209 - 2³ = 34805201 is a prime.

It is a super-2 number, since 2×34805209² = 2422805147067362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (34805201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17402604 + 17402605.

It is an arithmetic number, because the mean of its divisors is an integer number (17402605).

Almost surely, 2^34805209 is an apocalyptic number.

It is an amenable number.

34805209 is a deficient number, since it is larger than the sum of its proper divisors (1).

34805209 is an equidigital number, since it uses as much as digits as its factorization.

34805209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 34805209 is about 5899.5939690796. The cubic root of 34805209 is about 326.4986691127.

The spelling of 34805209 in words is "thirty-four million, eight hundred five thousand, two hundred nine".