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999999999989 is a prime number
BaseRepresentation
bin11101000110101001010…
…01010000111111110101
310112121011201102102110122
432203110221100333311
5112340444444444424
62043221010301325
7132150634516004
oct16432451207765
93477151372418
10999999999989
11356108a25991
12141981b87845
13733b8298833
1436586446c3b
151b02b76645e
hexe8d4a50ff5

999999999989 has 2 divisors, whose sum is σ = 999999999990. Its totient is φ = 999999999988.

The previous prime is 999999999961. The next prime is 1000000000039. The reversal of 999999999989 is 989999999999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 777645312964 + 222354687025 = 881842^2 + 471545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-999999999989 is a prime.

It is a super-9 number, since 9×9999999999899 (a number of 109 digits) contains 999999999 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999999999959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999999994 + 499999999995.

It is an arithmetic number, because the mean of its divisors is an integer number (499999999995).

Almost surely, 2999999999989 is an apocalyptic number.

It is an amenable number.

999999999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999999989 is an equidigital number, since it uses as much as digits as its factorization.

999999999989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 251048476872, while the sum is 107.

The spelling of 999999999989 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-nine".