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999980689 is a prime number
BaseRepresentation
bin111011100110100…
…111111010010001
32120200122021121211
4323212213322101
54021443340224
6243121020121
733531460411
oct7346477221
92520567554
10999980689
11473510324
1223aa84641
1312c231466
1496b44641
155cbca894
hex3b9a7e91

999980689 has 2 divisors, whose sum is σ = 999980690. Its totient is φ = 999980688.

The previous prime is 999980677. The next prime is 999980701. The reversal of 999980689 is 986089999.

It is a balanced prime because it is at equal distance from previous prime (999980677) and next prime (999980701).

It can be written as a sum of positive squares in only one way, i.e., 900480064 + 99500625 = 30008^2 + 9975^2 .

It is an emirp because it is prime and its reverse (986089999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-999980689 is a prime.

It is a super-2 number, since 2×9999806892 = 1999922756745829442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999980629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499990344 + 499990345.

It is an arithmetic number, because the mean of its divisors is an integer number (499990345).

Almost surely, 2999980689 is an apocalyptic number.

It is an amenable number.

999980689 is a deficient number, since it is larger than the sum of its proper divisors (1).

999980689 is an equidigital number, since it uses as much as digits as its factorization.

999980689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22674816, while the sum is 67.

The square root of 999980689 is about 31622.4712664902. The cubic root of 999980689 is about 999.9935629586.

The spelling of 999980689 in words is "nine hundred ninety-nine million, nine hundred eighty thousand, six hundred eighty-nine".