100806643 has 4 divisors (see below), whose sum is σ = 115207600. Its totient is φ = 86405688.

The previous prime is 100806619. The next prime is 100806653. The reversal of 100806643 is 346608001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346608001 = 17333 ⋅19997.

It is a cyclic number.

It is not a de Polignac number, because 100806643 - 2⁹ = 100806131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100806653) 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, 7200468 + ... + 7200481.

It is an arithmetic number, because the mean of its divisors is an integer number (28801900).

Almost surely, 2^100806643 is an apocalyptic number.

100806643 is a deficient number, since it is larger than the sum of its proper divisors (14400957).

100806643 is an equidigital number, since it uses as much as digits as its factorization.

100806643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14400956.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 100806643 is about 10040.2511422773. The cubic root of 100806643 is about 465.4035776371.

The spelling of 100806643 in words is "one hundred million, eight hundred six thousand, six hundred forty-three".