100802081 has 4 divisors (see below), whose sum is σ = 100822164. Its totient is φ = 100782000.

The previous prime is 100802069. The next prime is 100802099. The reversal of 100802081 is 180208001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82174225 + 18627856 = 9065^2 + 4316^2 .

It is a cyclic number.

It is not a de Polignac number, because 100802081 - 2⁶ = 100802017 is a prime.

It is a super-2 number, since 2×100802081² = 20322119067861122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100802041) 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, 4811 + ... + 14991.

It is an arithmetic number, because the mean of its divisors is an integer number (25205541).

Almost surely, 2^100802081 is an apocalyptic number.

It is an amenable number.

100802081 is a deficient number, since it is larger than the sum of its proper divisors (20083).

100802081 is an equidigital number, since it uses as much as digits as its factorization.

100802081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20082.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 100802081 is about 10040.0239541547. The cubic root of 100802081 is about 465.3965569254.

The spelling of 100802081 in words is "one hundred million, eight hundred two thousand, eighty-one".