124040209 has 2 divisors, whose sum is σ = 124040210. Its totient is φ = 124040208.

The previous prime is 124040153. The next prime is 124040233. The reversal of 124040209 is 902040421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123988225 + 51984 = 11135^2 + 228^2 .

It is a cyclic number.

It is not a de Polignac number, because 124040209 - 2⁹ = 124039697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 124040209.

It is not a weakly prime, because it can be changed into another prime (124040239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62020104 + 62020105.

It is an arithmetic number, because the mean of its divisors is an integer number (62020105).

Almost surely, 2^124040209 is an apocalyptic number.

It is an amenable number.

124040209 is a deficient number, since it is larger than the sum of its proper divisors (1).

124040209 is an equidigital number, since it uses as much as digits as its factorization.

124040209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 124040209 is about 11137.3340167205. The cubic root of 124040209 is about 498.7169892495.

The spelling of 124040209 in words is "one hundred twenty-four million, forty thousand, two hundred nine".