999989297 has 2 divisors, whose sum is σ = 999989298. Its totient is φ = 999989296.

The previous prime is 999989293. The next prime is 999989299. The reversal of 999989297 is 792989999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 911798416 + 88190881 = 30196^2 + 9391^2 .

It is an emirp because it is prime and its reverse (792989999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999989297 - 2² = 999989293 is a prime.

It is a super-2 number, since 2×999989297² = 1999957188229108418, which contains 22 as substring.

Together with 999989299, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999989297.

It is not a weakly prime, because it can be changed into another prime (999989293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499994648 + 499994649.

It is an arithmetic number, because the mean of its divisors is an integer number (499994649).

Almost surely, 2^999989297 is an apocalyptic number.

It is an amenable number.

999989297 is a deficient number, since it is larger than the sum of its proper divisors (1).

999989297 is an equidigital number, since it uses as much as digits as its factorization.

999989297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 59521392, while the sum is 71.

The square root of 999989297 is about 31622.6073719420. The cubic root of 999989297 is about 999.9964323206.

The spelling of 999989297 in words is "nine hundred ninety-nine million, nine hundred eighty-nine thousand, two hundred ninety-seven".