245009 has 4 divisors (see below), whose sum is σ = 246000. Its totient is φ = 244020.

The previous prime is 244997. The next prime is 245023. The reversal of 245009 is 900542.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 245009 - 2⁸ = 244753 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (245029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242 + ... + 740.

It is an arithmetic number, because the mean of its divisors is an integer number (61500).

2²⁴⁵⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

245009 is a deficient number, since it is larger than the sum of its proper divisors (991).

245009 is an equidigital number, since it uses as much as digits as its factorization.

245009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 245009 is about 494.9838381200. The cubic root of 245009 is about 62.5740136504.

The spelling of 245009 in words is "two hundred forty-five thousand, nine".