100105643 has 4 divisors (see below), whose sum is σ = 109206168. Its totient is φ = 91005120.

The previous prime is 100105631. The next prime is 100105657. The reversal of 100105643 is 346501001.

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

It is a cyclic number.

It is not a de Polignac number, because 100105643 - 2⁴ = 100105627 is a prime.

It is a super-2 number, since 2×100105643² = 20042279520886898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100105543) 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, 4550246 + ... + 4550267.

It is an arithmetic number, because the mean of its divisors is an integer number (27301542).

Almost surely, 2^100105643 is an apocalyptic number.

100105643 is a deficient number, since it is larger than the sum of its proper divisors (9100525).

100105643 is an equidigital number, since it uses as much as digits as its factorization.

100105643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9100524.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 100105643 is about 10005.2807556810. The cubic root of 100105643 is about 464.3222762934.

Adding to 100105643 its reverse (346501001), we get a palindrome (446606644).

The spelling of 100105643 in words is "one hundred million, one hundred five thousand, six hundred forty-three".