100009581 has 8 divisors (see below), whose sum is σ = 152395584. Its totient is φ = 57148320.

The previous prime is 100009573. The next prime is 100009607. The reversal of 100009581 is 185900001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 100009581 - 2³ = 100009573 is a prime.

It is a super-2 number, since 2×100009581² = 20003832583591122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100009501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2381160 + ... + 2381201.

It is an arithmetic number, because the mean of its divisors is an integer number (19049448).

Almost surely, 2^100009581 is an apocalyptic number.

It is an amenable number.

100009581 is a deficient number, since it is larger than the sum of its proper divisors (52386003).

100009581 is an equidigital number, since it uses as much as digits as its factorization.

100009581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4762371.

The product of its (nonzero) digits is 360, while the sum is 24.

The square root of 100009581 is about 10000.4790385261. The cubic root of 100009581 is about 464.1737065754.

Adding to 100009581 its reverse (185900001), we get a palindrome (285909582).

The spelling of 100009581 in words is "one hundred million, nine thousand, five hundred eighty-one".