99851 has 4 divisors (see below), whose sum is σ = 103104. Its totient is φ = 96600.

The previous prime is 99839. The next prime is 99859. The reversal of 99851 is 15899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15899 = 13 ⋅1223.

It is a cyclic number.

It is not a de Polignac number, because 99851 - 2⁶ = 99787 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99859) 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 in 3 ways as a sum of consecutive naturals, for example, 1580 + ... + 1641.

It is an arithmetic number, because the mean of its divisors is an integer number (25776).

2⁹⁹⁸⁵¹ is an apocalyptic number.

99851 is a deficient number, since it is larger than the sum of its proper divisors (3253).

99851 is a wasteful number, since it uses less digits than its factorization.

99851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3252.

The product of its digits is 3240, while the sum is 32.

The square root of 99851 is about 315.9920885086. The cubic root of 99851 is about 46.3928236523.

The spelling of 99851 in words is "ninety-nine thousand, eight hundred fifty-one".