245109 has 4 divisors (see below), whose sum is σ = 326816. Its totient is φ = 163404.

The previous prime is 245107. The next prime is 245129. The reversal of 245109 is 901542.

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.

It is not a de Polignac number, because 245109 - 2¹ = 245107 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245107) 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 3 ways as a sum of consecutive naturals, for example, 40849 + ... + 40854.

It is an arithmetic number, because the mean of its divisors is an integer number (81704).

2²⁴⁵¹⁰⁹ is an apocalyptic number.

It is an amenable number.

245109 is a deficient number, since it is larger than the sum of its proper divisors (81707).

245109 is an equidigital number, since it uses as much as digits as its factorization.

245109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81706.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 245109 is about 495.0848412141. The cubic root of 245109 is about 62.5825256510.

The spelling of 245109 in words is "two hundred forty-five thousand, one hundred nine".