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999969991 is a prime number
BaseRepresentation
bin111011100110100…
…101010011000111
32120200121201221121
4323212211103013
54021443014431
6243120454411
733531414256
oct7346452307
92520551847
10999969991
11473503289
1223aa7a407
1312c229627
1496b4079d
155cbc7611
hex3b9a54c7

999969991 has 2 divisors, whose sum is σ = 999969992. Its totient is φ = 999969990.

The previous prime is 999969961. The next prime is 999970003. The reversal of 999969991 is 199969999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999969991 - 25 = 999969959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999969991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999969931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499984995 + 499984996.

It is an arithmetic number, because the mean of its divisors is an integer number (499984996).

Almost surely, 2999969991 is an apocalyptic number.

999969991 is a deficient number, since it is larger than the sum of its proper divisors (1).

999969991 is an equidigital number, since it uses as much as digits as its factorization.

999969991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28697814, while the sum is 70.

The square root of 999969991 is about 31622.3021141725. The cubic root of 999969991 is about 999.9899968999.

The spelling of 999969991 in words is "nine hundred ninety-nine million, nine hundred sixty-nine thousand, nine hundred ninety-one".