100812081 has 16 divisors (see below), whose sum is σ = 144784640. Its totient is φ = 62188560.

The previous prime is 100812067. The next prime is 100812097. The reversal of 100812081 is 180218001.

It is not a de Polignac number, because 100812081 - 2⁶ = 100812017 is a prime.

It is a super-2 number, since 2×100812081² = 20326151351101122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100812011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18115 + ... + 23016.

It is an arithmetic number, because the mean of its divisors is an integer number (9049040).

Almost surely, 2^100812081 is an apocalyptic number.

It is an amenable number.

100812081 is a deficient number, since it is larger than the sum of its proper divisors (43972559).

100812081 is a wasteful number, since it uses less digits than its factorization.

100812081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41196.

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 100812081 is about 10040.5219485841. The cubic root of 100812081 is about 465.4119461966.

The spelling of 100812081 in words is "one hundred million, eight hundred twelve thousand, eighty-one".