999298691 has 2 divisors, whose sum is σ = 999298692. Its totient is φ = 999298690.

The previous prime is 999298667. The next prime is 999298693. The reversal of 999298691 is 196892999.

It is a strong prime.

It is an emirp because it is prime and its reverse (196892999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999298691 - 2¹⁰ = 999297667 is a prime.

Together with 999298693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999298693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499649345 + 499649346.

It is an arithmetic number, because the mean of its divisors is an integer number (499649346).

Almost surely, 2^999298691 is an apocalyptic number.

999298691 is a deficient number, since it is larger than the sum of its proper divisors (1).

999298691 is an equidigital number, since it uses as much as digits as its factorization.

999298691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5668704, while the sum is 62.

The square root of 999298691 is about 31611.6859879381. The cubic root of 999298691 is about 999.7661756638.

The spelling of 999298691 in words is "nine hundred ninety-nine million, two hundred ninety-eight thousand, six hundred ninety-one".