124399379981809 has 3 divisors (see below), whose sum is σ = 124399391135257. Its totient is φ = 124399368828362.

The previous prime is 124399379981783. The next prime is 124399379981813. The reversal of 124399379981809 is 908189973993421.

It is a happy number.

The square root of 124399379981809 is 11153447.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 124399379981809 - 2¹¹ = 124399379979761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124399379981309) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5576724 + ... + 16730170.

Almost surely, 2^{124399379981809} is an apocalyptic number.

124399379981809 is the 11153447-th square number.

124399379981809 is the 5576724-th centered octagonal number.

It is an amenable number.

124399379981809 is a deficient number, since it is larger than the sum of its proper divisors (11153448).

124399379981809 is an frugal number, since it uses more digits than its factorization.

124399379981809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22306894 (or 11153447 counting only the distinct ones).

The product of its (nonzero) digits is 1904684544, while the sum is 82.

The spelling of 124399379981809 in words is "one hundred twenty-four trillion, three hundred ninety-nine billion, three hundred seventy-nine million, nine hundred eighty-one thousand, eight hundred nine".