245609 has 8 divisors (see below), whose sum is σ = 302400. Its totient is φ = 194256.

The previous prime is 245593. The next prime is 245621. The reversal of 245609 is 906542.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 245609 - 2⁴ = 245593 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (245629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1259 + ... + 1440.

It is an arithmetic number, because the mean of its divisors is an integer number (37800).

2²⁴⁵⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

245609 is a deficient number, since it is larger than the sum of its proper divisors (56791).

245609 is a wasteful number, since it uses less digits than its factorization.

245609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2719.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 245609 is about 495.5895479124. The cubic root of 245609 is about 62.6250509626.

The spelling of 245609 in words is "two hundred forty-five thousand, six hundred nine".