991343 has 2 divisors, whose sum is σ = 991344. Its totient is φ = 991342.

The previous prime is 991327. The next prime is 991357. The reversal of 991343 is 343199.

It is a strong prime.

It is an emirp because it is prime and its reverse (343199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 991343 - 2⁴ = 991327 is a prime.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991343.

It is not a weakly prime, because it can be changed into another prime (991313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495671 + 495672.

It is an arithmetic number, because the mean of its divisors is an integer number (495672).

2⁹⁹¹³⁴³ is an apocalyptic number.

991343 is a deficient number, since it is larger than the sum of its proper divisors (1).

991343 is an equidigital number, since it uses as much as digits as its factorization.

991343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 29.

The square root of 991343 is about 995.6620912739. The cubic root of 991343 is about 99.7105965980.

The spelling of 991343 in words is "nine hundred ninety-one thousand, three hundred forty-three".