9961543 has 2 divisors, whose sum is σ = 9961544. Its totient is φ = 9961542.

The previous prime is 9961531. The next prime is 9961573. The reversal of 9961543 is 3451699.

It is a weak prime.

It is an emirp because it is prime and its reverse (3451699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9961543 - 2²¹ = 7864391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9961573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4980771 + 4980772.

It is an arithmetic number, because the mean of its divisors is an integer number (4980772).

Almost surely, 2^9961543 is an apocalyptic number.

9961543 is a deficient number, since it is larger than the sum of its proper divisors (1).

9961543 is an equidigital number, since it uses as much as digits as its factorization.

9961543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 37.

The square root of 9961543 is about 3156.1912172744. The cubic root of 9961543 is about 215.1669372307.

The spelling of 9961543 in words is "nine million, nine hundred sixty-one thousand, five hundred forty-three".