100643521 has 8 divisors (see below), whose sum is σ = 112346784. Its totient is φ = 89365920.

The previous prime is 100643483. The next prime is 100643527. The reversal of 100643521 is 125346001.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100643521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100643492 and 100643501.

It is not an unprimeable number, because it can be changed into a prime (100643527) 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 7 ways as a sum of consecutive naturals, for example, 105916 + ... + 106861.

It is an arithmetic number, because the mean of its divisors is an integer number (14043348).

Almost surely, 2^100643521 is an apocalyptic number.

100643521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100643521 is a deficient number, since it is larger than the sum of its proper divisors (11703263).

100643521 is a wasteful number, since it uses less digits than its factorization.

100643521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212831.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 100643521 is about 10032.1244509825. The cubic root of 100643521 is about 465.1524085141.

Adding to 100643521 its reverse (125346001), we get a palindrome (225989522).

The spelling of 100643521 in words is "one hundred million, six hundred forty-three thousand, five hundred twenty-one".