991327 has 2 divisors, whose sum is σ = 991328. Its totient is φ = 991326.

The previous prime is 991313. The next prime is 991343. The reversal of 991327 is 723199.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 991327 - 2¹¹ = 989279 is a prime.

991327 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991357) 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, 495663 + 495664.

It is an arithmetic number, because the mean of its divisors is an integer number (495664).

2⁹⁹¹³²⁷ is an apocalyptic number.

991327 is a deficient number, since it is larger than the sum of its proper divisors (1).

991327 is an equidigital number, since it uses as much as digits as its factorization.

991327 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 31.

The square root of 991327 is about 995.6540563871. The cubic root of 991327 is about 99.7100601614.

The spelling of 991327 in words is "nine hundred ninety-one thousand, three hundred twenty-seven".