109905641 has 4 divisors (see below), whose sum is σ = 109926612. Its totient is φ = 109884672.

The previous prime is 109905637. The next prime is 109905659. The reversal of 109905641 is 146509901.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 146509901 = 43 ⋅3407207.

It can be written as a sum of positive squares in 2 ways, for example, as 22090000 + 87815641 = 4700^2 + 9371^2 .

It is a cyclic number.

It is not a de Polignac number, because 109905641 - 2² = 109905637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109905541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4985 + ... + 15641.

It is an arithmetic number, because the mean of its divisors is an integer number (27481653).

Almost surely, 2^109905641 is an apocalyptic number.

It is an amenable number.

109905641 is a deficient number, since it is larger than the sum of its proper divisors (20971).

109905641 is a wasteful number, since it uses less digits than its factorization.

109905641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20970.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 109905641 is about 10483.5891277749. The cubic root of 109905641 is about 479.0049423961.

The spelling of 109905641 in words is "one hundred nine million, nine hundred five thousand, six hundred forty-one".