124017809 has 2 divisors, whose sum is σ = 124017810. Its totient is φ = 124017808.

The previous prime is 124017793. The next prime is 124017811. The reversal of 124017809 is 908710421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123988225 + 29584 = 11135^2 + 172^2 .

It is a cyclic number.

It is not a de Polignac number, because 124017809 - 2⁴ = 124017793 is a prime.

Together with 124017811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (124017889) 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, 62008904 + 62008905.

It is an arithmetic number, because the mean of its divisors is an integer number (62008905).

Almost surely, 2^124017809 is an apocalyptic number.

It is an amenable number.

124017809 is a deficient number, since it is larger than the sum of its proper divisors (1).

124017809 is an equidigital number, since it uses as much as digits as its factorization.

124017809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 124017809 is about 11136.3283446565. The cubic root of 124017809 is about 498.6869669065.

The spelling of 124017809 in words is "one hundred twenty-four million, seventeen thousand, eight hundred nine".