999855113 has 4 divisors (see below), whose sum is σ = 1006565700. Its totient is φ = 993144528.

The previous prime is 999855079. The next prime is 999855173. The reversal of 999855113 is 311558999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 311558999 = 59 ⋅5280661.

It can be written as a sum of positive squares in 2 ways, for example, as 131492089 + 868363024 = 11467^2 + 29468^2 .

It is a cyclic number.

It is not a de Polignac number, because 999855113 - 2⁸ = 999854857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999855173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3355070 + ... + 3355367.

It is an arithmetic number, because the mean of its divisors is an integer number (251641425).

Almost surely, 2^999855113 is an apocalyptic number.

It is an amenable number.

999855113 is a deficient number, since it is larger than the sum of its proper divisors (6710587).

999855113 is a wasteful number, since it uses less digits than its factorization.

999855113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6710586.

The product of its digits is 437400, while the sum is 50.

The square root of 999855113 is about 31620.4856540819. The cubic root of 999855113 is about 999.9517020007.

The spelling of 999855113 in words is "nine hundred ninety-nine million, eight hundred fifty-five thousand, one hundred thirteen".