124311399985 has 4 divisors (see below), whose sum is σ = 149173679988. Its totient is φ = 99449119984.

The previous prime is 124311399973. The next prime is 124311400027. The reversal of 124311399985 is 589993113421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 589993113421 = 27947 ⋅21111143.

It can be written as a sum of positive squares in 2 ways, for example, as 24002375329 + 100309024656 = 154927^2 + 316716^2 .

It is a cyclic number.

It is not a de Polignac number, because 124311399985 - 2¹⁹ = 124310875697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12431139994 + ... + 12431140003.

It is an arithmetic number, because the mean of its divisors is an integer number (37293419997).

Almost surely, 2^124311399985 is an apocalyptic number.

It is an amenable number.

124311399985 is a deficient number, since it is larger than the sum of its proper divisors (24862280003).

124311399985 is an equidigital number, since it uses as much as digits as its factorization.

124311399985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24862280002.

The product of its digits is 2099520, while the sum is 55.

The spelling of 124311399985 in words is "one hundred twenty-four billion, three hundred eleven million, three hundred ninety-nine thousand, nine hundred eighty-five".