123165609 has 16 divisors (see below), whose sum is σ = 189944832. Its totient is φ = 69531408.

The previous prime is 123165547. The next prime is 123165643. The reversal of 123165609 is 906561321.

It is a happy number.

It is not a de Polignac number, because 123165609 - 2¹² = 123161513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123165609.

It is not an unprimeable number, because it can be changed into a prime (123165689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33589 + ... + 37074.

It is an arithmetic number, because the mean of its divisors is an integer number (11871552).

Almost surely, 2^123165609 is an apocalyptic number.

It is an amenable number.

123165609 is a deficient number, since it is larger than the sum of its proper divisors (66779223).

123165609 is an equidigital number, since it uses as much as digits as its factorization.

123165609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70756.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 123165609 is about 11098.0002252658. Note that the first 3 decimals coincide. The cubic root of 123165609 is about 497.5420824145.

The spelling of 123165609 in words is "one hundred twenty-three million, one hundred sixty-five thousand, six hundred nine".