991499 has 2 divisors, whose sum is σ = 991500. Its totient is φ = 991498.

The previous prime is 991493. The next prime is 991511. The reversal of 991499 is 994199.

It is a weak prime.

It is an emirp because it is prime and its reverse (994199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 991499 - 2⁴ = 991483 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991499.

It is not a weakly prime, because it can be changed into another prime (991493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495749 + 495750.

It is an arithmetic number, because the mean of its divisors is an integer number (495750).

2⁹⁹¹⁴⁹⁹ is an apocalyptic number.

991499 is a deficient number, since it is larger than the sum of its proper divisors (1).

991499 is an equidigital number, since it uses as much as digits as its factorization.

991499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 41.

The square root of 991499 is about 995.7404280233. The cubic root of 991499 is about 99.7158265528.

The spelling of 991499 in words is "nine hundred ninety-one thousand, four hundred ninety-nine".