99871 has 2 divisors, whose sum is σ = 99872. Its totient is φ = 99870.

The previous prime is 99859. The next prime is 99877. The reversal of 99871 is 17899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99871 - 2⁵ = 99839 is a prime.

It is a nialpdrome in base 10.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49935 + 49936.

It is an arithmetic number, because the mean of its divisors is an integer number (49936).

2⁹⁹⁸⁷¹ is an apocalyptic number.

99871 is a deficient number, since it is larger than the sum of its proper divisors (1).

99871 is an equidigital number, since it uses as much as digits as its factorization.

99871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 34.

The square root of 99871 is about 316.0237332860. The cubic root of 99871 is about 46.3959209157.

The spelling of 99871 in words is "ninety-nine thousand, eight hundred seventy-one".