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999817813 is a prime number
BaseRepresentation
bin111011100110000…
…000001001010101
32120200100000012101
4323212000021111
54021423132223
6243113322101
733530211511
oct7346001125
92520300171
10999817813
11473409a15
1223aa06331
1312c1a5297
1496b01141
155cb974ad
hex3b980255

999817813 has 2 divisors, whose sum is σ = 999817814. Its totient is φ = 999817812.

The previous prime is 999817789. The next prime is 999817817. The reversal of 999817813 is 318718999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 993951729 + 5866084 = 31527^2 + 2422^2 .

It is a cyclic number.

It is not a de Polignac number, because 999817813 - 217 = 999686741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999817817) 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, 499908906 + 499908907.

It is an arithmetic number, because the mean of its divisors is an integer number (499908907).

Almost surely, 2999817813 is an apocalyptic number.

It is an amenable number.

999817813 is a deficient number, since it is larger than the sum of its proper divisors (1).

999817813 is an equidigital number, since it uses as much as digits as its factorization.

999817813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 55.

The square root of 999817813 is about 31619.8958410682. The cubic root of 999817813 is about 999.9392673116.

The spelling of 999817813 in words is "nine hundred ninety-nine million, eight hundred seventeen thousand, eight hundred thirteen".