108215609 has 2 divisors, whose sum is σ = 108215610. Its totient is φ = 108215608.

The previous prime is 108215599. The next prime is 108215633. The reversal of 108215609 is 906512801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57805609 + 50410000 = 7603^2 + 7100^2 .

It is an emirp because it is prime and its reverse (906512801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 108215609 - 2⁴ = 108215593 is a prime.

It is not a weakly prime, because it can be changed into another prime (108215669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54107804 + 54107805.

It is an arithmetic number, because the mean of its divisors is an integer number (54107805).

Almost surely, 2^108215609 is an apocalyptic number.

It is an amenable number.

108215609 is a deficient number, since it is larger than the sum of its proper divisors (1).

108215609 is an equidigital number, since it uses as much as digits as its factorization.

108215609 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 32.

The square root of 108215609 is about 10402.6731660665. The cubic root of 108215609 is about 476.5370104486.

The spelling of 108215609 in words is "one hundred eight million, two hundred fifteen thousand, six hundred nine".