9905641 has 4 divisors (see below), whose sum is σ = 10147284. Its totient is φ = 9664000.

The previous prime is 9905639. The next prime is 9905653. The reversal of 9905641 is 1465099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1465099 = 809 ⋅1811.

It can be written as a sum of positive squares in 2 ways, for example, as 2088025 + 7817616 = 1445^2 + 2796^2 .

It is a cyclic number.

It is not a de Polignac number, because 9905641 - 2¹ = 9905639 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9905597 and 9905606.

It is not an unprimeable number, because it can be changed into a prime (9905671) 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, 120760 + ... + 120841.

It is an arithmetic number, because the mean of its divisors is an integer number (2536821).

Almost surely, 2^9905641 is an apocalyptic number.

It is an amenable number.

9905641 is a deficient number, since it is larger than the sum of its proper divisors (241643).

9905641 is a wasteful number, since it uses less digits than its factorization.

9905641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241642.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 9905641 is about 3147.3228305975. The cubic root of 9905641 is about 214.7636920531.

The spelling of 9905641 in words is "nine million, nine hundred five thousand, six hundred forty-one".