100805817 has 16 divisors (see below), whose sum is σ = 155555840. Its totient is φ = 56873232.

The previous prime is 100805813. The next prime is 100805851. The reversal of 100805817 is 718508001.

It is not a de Polignac number, because 100805817 - 2² = 100805813 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100805813) 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 15 ways as a sum of consecutive naturals, for example, 28723 + ... + 32040.

It is an arithmetic number, because the mean of its divisors is an integer number (9722240).

Almost surely, 2^100805817 is an apocalyptic number.

It is an amenable number.

100805817 is a deficient number, since it is larger than the sum of its proper divisors (54750023).

100805817 is an equidigital number, since it uses as much as digits as its factorization.

100805817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60852.

The product of its (nonzero) digits is 2240, while the sum is 30.

The square root of 100805817 is about 10040.2100077638. The cubic root of 100805817 is about 465.4023064762.

The spelling of 100805817 in words is "one hundred million, eight hundred five thousand, eight hundred seventeen".