999855911 has 2 divisors, whose sum is σ = 999855912. Its totient is φ = 999855910.

The previous prime is 999855893. The next prime is 999855919. The reversal of 999855911 is 119558999.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999855911 - 2²⁶ = 932747047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999855919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499927955 + 499927956.

It is an arithmetic number, because the mean of its divisors is an integer number (499927956).

Almost surely, 2^999855911 is an apocalyptic number.

999855911 is a deficient number, since it is larger than the sum of its proper divisors (1).

999855911 is an equidigital number, since it uses as much as digits as its factorization.

999855911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1312200, while the sum is 56.

The square root of 999855911 is about 31620.4982724814. The cubic root of 999855911 is about 999.9519680263.

The spelling of 999855911 in words is "nine hundred ninety-nine million, eight hundred fifty-five thousand, nine hundred eleven".