215305009 has 2 divisors, whose sum is σ = 215305010. Its totient is φ = 215305008.

The previous prime is 215305003. The next prime is 215305021. The reversal of 215305009 is 900503512.

215305009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200505600 + 14799409 = 14160^2 + 3847^2 .

It is a cyclic number.

It is not a de Polignac number, because 215305009 - 2¹¹ = 215302961 is a prime.

It is not a weakly prime, because it can be changed into another prime (215305003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107652504 + 107652505.

It is an arithmetic number, because the mean of its divisors is an integer number (107652505).

Almost surely, 2^215305009 is an apocalyptic number.

It is an amenable number.

215305009 is a deficient number, since it is larger than the sum of its proper divisors (1).

215305009 is an equidigital number, since it uses as much as digits as its factorization.

215305009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 215305009 is about 14673.2753330673. The cubic root of 215305009 is about 599.3557984029.

The spelling of 215305009 in words is "two hundred fifteen million, three hundred five thousand, nine".