124478909 has 2 divisors, whose sum is σ = 124478910. Its totient is φ = 124478908.

The previous prime is 124478903. The next prime is 124478941. The reversal of 124478909 is 909874421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106543684 + 17935225 = 10322^2 + 4235^2 .

It is an emirp because it is prime and its reverse (909874421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-124478909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 124478909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124478903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62239454 + 62239455.

It is an arithmetic number, because the mean of its divisors is an integer number (62239455).

Almost surely, 2^124478909 is an apocalyptic number.

It is an amenable number.

124478909 is a deficient number, since it is larger than the sum of its proper divisors (1).

124478909 is an equidigital number, since it uses as much as digits as its factorization.

124478909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 124478909 is about 11157.0116518717. The cubic root of 124478909 is about 499.3042442971.

The spelling of 124478909 in words is "one hundred twenty-four million, four hundred seventy-eight thousand, nine hundred nine".