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998128889 is a prime number
BaseRepresentation
bin111011011111100…
…011110011111001
32120120011012102122
4323133203303321
54021010111024
6243013211025
733506645522
oct7337436371
92516135378
10998128889
1147246600a
1223a330a75
1312ba33614
14967c1849
155c961d5e
hex3b7e3cf9

998128889 has 2 divisors, whose sum is σ = 998128890. Its totient is φ = 998128888.

The previous prime is 998128847. The next prime is 998128891. The reversal of 998128889 is 988821899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 609250489 + 388878400 = 24683^2 + 19720^2 .

It is a cyclic number.

It is not a de Polignac number, because 998128889 - 220 = 997080313 is a prime.

It is a super-2 number, since 2×9981288892 = 1992522558112748642, which contains 22 as substring.

Together with 998128891, 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 (998128289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499064444 + 499064445.

It is an arithmetic number, because the mean of its divisors is an integer number (499064445).

Almost surely, 2998128889 is an apocalyptic number.

It is an amenable number.

998128889 is a deficient number, since it is larger than the sum of its proper divisors (1).

998128889 is an equidigital number, since it uses as much as digits as its factorization.

998128889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5971968, while the sum is 62.

The square root of 998128889 is about 31593.1778870059. The cubic root of 998128889 is about 999.3759069222.

The spelling of 998128889 in words is "nine hundred ninety-eight million, one hundred twenty-eight thousand, eight hundred eighty-nine".