99971 has 2 divisors, whose sum is σ = 99972.
Its totient is φ = 99970.
The previous prime is 99961. The next prime is 99989. The reversal of 99971 is 17999.
It is a happy number.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 99971 - 26 = 99907 is a prime.
It is a Chen prime.
It is a nialpdrome in base 10.
It is not a weakly prime, because it can be changed into another prime (99901) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49985 + 49986.
It is an arithmetic number, because the mean of its divisors is an integer number (49986).
299971 is an apocalyptic number.
99971 is a deficient number, since it is larger than the sum of its proper divisors (1).
99971 is an equidigital number, since it uses as much as digits as its factorization.
99971 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 5103, while the sum is 35.
The square root of 99971 is about 316.1819096659.
The cubic root of 99971 is about 46.4114010331.
The spelling of 99971 in words is "ninety-nine thousand, nine hundred seventy-one".