11659643 has 4 divisors (see below), whose sum is σ = 12166608. Its totient is φ = 11152680.

The previous prime is 11659631. The next prime is 11659651. The reversal of 11659643 is 34695611.

11659643 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34695611 = 941 ⋅36871.

It is a cyclic number.

It is not a de Polignac number, because 11659643 - 2⁸ = 11659387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11659693) 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, 253448 + ... + 253493.

It is an arithmetic number, because the mean of its divisors is an integer number (3041652).

Almost surely, 2^11659643 is an apocalyptic number.

11659643 is a deficient number, since it is larger than the sum of its proper divisors (506965).

11659643 is an equidigital number, since it uses as much as digits as its factorization.

11659643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506964.

The product of its digits is 19440, while the sum is 35.

The square root of 11659643 is about 3414.6219410061. The cubic root of 11659643 is about 226.7575474190.

The spelling of 11659643 in words is "eleven million, six hundred fifty-nine thousand, six hundred forty-three".