9840661 has 2 divisors, whose sum is σ = 9840662. Its totient is φ = 9840660.

The previous prime is 9840659. The next prime is 9840667. The reversal of 9840661 is 1660489.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9492561 + 348100 = 3081^2 + 590^2 .

It is an emirp because it is prime and its reverse (1660489) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9840661 - 2¹ = 9840659 is a prime.

Together with 9840659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9840667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4920330 + 4920331.

It is an arithmetic number, because the mean of its divisors is an integer number (4920331).

Almost surely, 2^9840661 is an apocalyptic number.

It is an amenable number.

9840661 is a deficient number, since it is larger than the sum of its proper divisors (1).

9840661 is an equidigital number, since it uses as much as digits as its factorization.

9840661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 9840661 is about 3136.9827860541. The cubic root of 9840661 is about 214.2930520874.

It can be divided in two parts, 9840 and 661, that added together give a palindrome (10501).

The spelling of 9840661 in words is "nine million, eight hundred forty thousand, six hundred sixty-one".