999980231 has 2 divisors, whose sum is σ = 999980232.
Its totient is φ = 999980230.
The previous prime is 999980213. The next prime is 999980281. The reversal of 999980231 is 132089999.
Together with previous prime (999980213) it forms an Ormiston pair, because they use the same digits, order apart.
It is an a-pointer prime, because the next prime (999980281) can be obtained adding 999980231 to its sum of digits (50).
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 999980231 - 222 = 995785927 is a prime.
It is a super-2 number, since 2×9999802312 = 1999920924781626722, which contains 22 as substring.
It is a self number, because there is not a number n which added to its sum of digits gives 999980231.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (999980281) 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 as a sum of consecutive naturals, namely, 499990115 + 499990116.
It is an arithmetic number, because the mean of its divisors is an integer number (499990116).
Almost surely, 2999980231 is an apocalyptic number.
999980231 is a deficient number, since it is larger than the sum of its proper divisors (1).
999980231 is an equidigital number, since it uses as much as digits as its factorization.
999980231 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 314928, while the sum is 50.
The square root of 999980231 is about 31622.4640248036.
The cubic root of 999980231 is about 999.9934102899.
The spelling of 999980231 in words is "nine hundred ninety-nine million, nine hundred eighty thousand, two hundred thirty-one".