100851 has 4 divisors (see below), whose sum is σ = 134472. Its totient is φ = 67232.

The previous prime is 100847. The next prime is 100853. The reversal of 100851 is 158001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 158001 = 3 ⋅52667.

It is a cyclic number.

It is not a de Polignac number, because 100851 - 2² = 100847 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 100851.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 100851.

It is not an unprimeable number, because it can be changed into a prime (100853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16806 + ... + 16811.

It is an arithmetic number, because the mean of its divisors is an integer number (33618).

2¹⁰⁰⁸⁵¹ is an apocalyptic number.

100851 is a deficient number, since it is larger than the sum of its proper divisors (33621).

100851 is an equidigital number, since it uses as much as digits as its factorization.

100851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33620.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 100851 is about 317.5704646216. The cubic root of 100851 is about 46.5471830015.

Adding to 100851 its reverse (158001), we get a palindrome (258852).

The spelling of 100851 in words is "one hundred thousand, eight hundred fifty-one".