124031809 has 4 divisors (see below), whose sum is σ = 135307440. Its totient is φ = 112756180.

The previous prime is 124031783. The next prime is 124031821. The reversal of 124031809 is 908130421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 908130421 = 11 ⋅82557311.

It is a cyclic number.

It is not a de Polignac number, because 124031809 - 2⁵ = 124031777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124031309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5637799 + ... + 5637820.

It is an arithmetic number, because the mean of its divisors is an integer number (33826860).

Almost surely, 2^124031809 is an apocalyptic number.

It is an amenable number.

124031809 is a deficient number, since it is larger than the sum of its proper divisors (11275631).

124031809 is a wasteful number, since it uses less digits than its factorization.

124031809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11275630.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 124031809 is about 11136.9569003386. The cubic root of 124031809 is about 498.7057312945.

The spelling of 124031809 in words is "one hundred twenty-four million, thirty-one thousand, eight hundred nine".