999111143 has 4 divisors (see below), whose sum is σ = 1051695960. Its totient is φ = 946526328.

The previous prime is 999111119. The next prime is 999111163. The reversal of 999111143 is 341111999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999111143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 999111097 and 999111106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999111163) by changing a digit.

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, 26292380 + ... + 26292417.

It is an arithmetic number, because the mean of its divisors is an integer number (262923990).

Almost surely, 2^999111143 is an apocalyptic number.

999111143 is a deficient number, since it is larger than the sum of its proper divisors (52584817).

999111143 is a wasteful number, since it uses less digits than its factorization.

999111143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52584816.

The product of its digits is 8748, while the sum is 38.

The square root of 999111143 is about 31608.7194141110. The cubic root of 999111143 is about 999.7036265048.

The spelling of 999111143 in words is "nine hundred ninety-nine million, one hundred eleven thousand, one hundred forty-three".