624109 has 4 divisors (see below), whose sum is σ = 645660. Its totient is φ = 602560.

The previous prime is 624097. The next prime is 624119. The reversal of 624109 is 901426.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 324900 + 299209 = 570^2 + 547^2 .

It is a cyclic number.

It is not a de Polignac number, because 624109 - 2¹⁵ = 591341 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 624109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (624119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10732 + ... + 10789.

It is an arithmetic number, because the mean of its divisors is an integer number (161415).

2⁶²⁴¹⁰⁹ is an apocalyptic number.

It is an amenable number.

624109 is a deficient number, since it is larger than the sum of its proper divisors (21551).

624109 is a wasteful number, since it uses less digits than its factorization.

624109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21550.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 624109 is about 790.0056961820. The cubic root of 624109 is about 85.4581489831.

The spelling of 624109 in words is "six hundred twenty-four thousand, one hundred nine".