100800855 has 20 divisors (see below), whose sum is σ = 180695592. Its totient is φ = 53760240.

The previous prime is 100800841. The next prime is 100800857. The reversal of 100800855 is 558008001.

It is not a de Polignac number, because 100800855 - 2¹¹ = 100798807 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100800857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 124041 + ... + 124850.

Almost surely, 2^100800855 is an apocalyptic number.

100800855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

100800855 is a deficient number, since it is larger than the sum of its proper divisors (79894737).

100800855 is an equidigital number, since it uses as much as digits as its factorization.

100800855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248908 (or 248899 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 27.

The square root of 100800855 is about 10039.9628983378. The cubic root of 100800855 is about 465.3946701307.

Adding to 100800855 its reverse (558008001), we get a palindrome (658808856).

The spelling of 100800855 in words is "one hundred million, eight hundred thousand, eight hundred fifty-five".