100081009 has 4 divisors (see below), whose sum is σ = 114378304. Its totient is φ = 85783716.

The previous prime is 100080997. The next prime is 100081031. The reversal of 100081009 is 900180001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 900180001 = 7 ⋅128597143.

It is a cyclic number.

It is not a de Polignac number, because 100081009 - 2⁵ = 100080977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100081039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7148637 + ... + 7148650.

It is an arithmetic number, because the mean of its divisors is an integer number (28594576).

Almost surely, 2^100081009 is an apocalyptic number.

It is an amenable number.

100081009 is a deficient number, since it is larger than the sum of its proper divisors (14297295).

100081009 is an equidigital number, since it uses as much as digits as its factorization.

100081009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14297294.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 100081009 is about 10004.0496300248. The cubic root of 100081009 is about 464.2841863551.

The spelling of 100081009 in words is "one hundred million, eighty-one thousand, nine".