99999827 has 2 divisors, whose sum is σ = 99999828.
Its totient is φ = 99999826.
The previous prime is 99999821. The next prime is 99999839. The reversal of 99999827 is 72899999.
It is a weak prime.
It is an emirp because it is prime and its reverse (72899999) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 99999827 - 216 = 99934291 is a prime.
It is a Chen prime.
It is a self number, because there is not a number n which added to its sum of digits gives 99999827.
It is not a weakly prime, because it can be changed into another prime (99999821) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999913 + 49999914.
It is an arithmetic number, because the mean of its divisors is an integer number (49999914).
Almost surely, 299999827 is an apocalyptic number.
99999827 is a deficient number, since it is larger than the sum of its proper divisors (1).
99999827 is an equidigital number, since it uses as much as digits as its factorization.
99999827 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 6613488, while the sum is 62.
The square root of 99999827 is about 9999.9913499963.
The cubic root of 99999827 is about 464.1586156962.
The spelling of 99999827 in words is "ninety-nine million, nine hundred ninety-nine thousand, eight hundred twenty-seven".