9961643 has 8 divisors (see below), whose sum is σ = 11103120. Its totient is φ = 8881920.

The previous prime is 9961631. The next prime is 9961649. The reversal of 9961643 is 3461699.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9961643 - 2⁶ = 9961579 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9961597 and 9961606.

It is not an unprimeable number, because it can be changed into a prime (9961649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15098 + ... + 15743.

It is an arithmetic number, because the mean of its divisors is an integer number (1387890).

Almost surely, 2^9961643 is an apocalyptic number.

9961643 is a deficient number, since it is larger than the sum of its proper divisors (1141477).

9961643 is a wasteful number, since it uses less digits than its factorization.

9961643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30877.

The product of its digits is 34992, while the sum is 38.

The square root of 9961643 is about 3156.2070591138. The cubic root of 9961643 is about 215.1676572203.

The spelling of 9961643 in words is "nine million, nine hundred sixty-one thousand, six hundred forty-three".