100643541 has 4 divisors (see below), whose sum is σ = 134191392. Its totient is φ = 67095692.

The previous prime is 100643531. The next prime is 100643549. The reversal of 100643541 is 145346001.

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.

It is a cyclic number.

It is not a de Polignac number, because 100643541 - 2¹³ = 100635349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100643549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16773921 + ... + 16773926.

It is an arithmetic number, because the mean of its divisors is an integer number (33547848).

Almost surely, 2^100643541 is an apocalyptic number.

It is an amenable number.

100643541 is a deficient number, since it is larger than the sum of its proper divisors (33547851).

100643541 is an equidigital number, since it uses as much as digits as its factorization.

100643541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33547850.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 100643541 is about 10032.1254477802. The cubic root of 100643541 is about 465.1524393260.

Adding to 100643541 its reverse (145346001), we get a palindrome (245989542).

The spelling of 100643541 in words is "one hundred million, six hundred forty-three thousand, five hundred forty-one".