109609 has 2 divisors, whose sum is σ = 109610. Its totient is φ = 109608.

The previous prime is 109597. The next prime is 109619. The reversal of 109609 is 906901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107584 + 2025 = 328^2 + 45^2 .

It is an emirp because it is prime and its reverse (906901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 109609 - 2⁷ = 109481 is a prime.

109609 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (109619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54804 + 54805.

It is an arithmetic number, because the mean of its divisors is an integer number (54805).

2¹⁰⁹⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

109609 is a deficient number, since it is larger than the sum of its proper divisors (1).

109609 is an equidigital number, since it uses as much as digits as its factorization.

109609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 109609 is about 331.0724996130. The cubic root of 109609 is about 47.8573601068.

The spelling of 109609 in words is "one hundred nine thousand, six hundred nine".