215240609 has 2 divisors, whose sum is σ = 215240610. Its totient is φ = 215240608.

The previous prime is 215240593. The next prime is 215240633. The reversal of 215240609 is 906042512.

It is a happy number.

215240609 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., 143041600 + 72199009 = 11960^2 + 8497^2 .

It is a cyclic number.

It is not a de Polignac number, because 215240609 - 2⁴ = 215240593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (215240659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107620304 + 107620305.

It is an arithmetic number, because the mean of its divisors is an integer number (107620305).

Almost surely, 2^215240609 is an apocalyptic number.

It is an amenable number.

215240609 is a deficient number, since it is larger than the sum of its proper divisors (1).

215240609 is an equidigital number, since it uses as much as digits as its factorization.

215240609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 215240609 is about 14671.0807032066. The cubic root of 215240609 is about 599.2960345626.

The spelling of 215240609 in words is "two hundred fifteen million, two hundred forty thousand, six hundred nine".