124909 has 2 divisors, whose sum is σ = 124910. Its totient is φ = 124908.

The previous prime is 124907. The next prime is 124919. The reversal of 124909 is 909421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75625 + 49284 = 275^2 + 222^2 .

It is a cyclic number.

It is not a de Polignac number, because 124909 - 2¹ = 124907 is a prime.

Together with 124907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124907) 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 as a sum of consecutive naturals, namely, 62454 + 62455.

It is an arithmetic number, because the mean of its divisors is an integer number (62455).

2¹²⁴⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

124909 is a deficient number, since it is larger than the sum of its proper divisors (1).

124909 is an equidigital number, since it uses as much as digits as its factorization.

124909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 124909 is about 353.4246737284. The cubic root of 124909 is about 49.9878637211.

The spelling of 124909 in words is "one hundred twenty-four thousand, nine hundred nine".