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999981613 is a prime number
BaseRepresentation
bin111011100110101…
…000001000101101
32120200122022220001
4323212220020231
54021443402423
6243121024301
733531463201
oct7346501055
92520568801
10999981613
11473510a94
1223aa85091
1312c2319c7
1496b44b01
155cbcacad
hex3b9a822d

999981613 has 2 divisors, whose sum is σ = 999981614. Its totient is φ = 999981612.

The previous prime is 999981607. The next prime is 999981637. The reversal of 999981613 is 316189999.

999981613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 899220169 + 100761444 = 29987^2 + 10038^2 .

It is an emirp because it is prime and its reverse (316189999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999981613 - 213 = 999973421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999981313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499990806 + 499990807.

It is an arithmetic number, because the mean of its divisors is an integer number (499990807).

Almost surely, 2999981613 is an apocalyptic number.

It is an amenable number.

999981613 is a deficient number, since it is larger than the sum of its proper divisors (1).

999981613 is an equidigital number, since it uses as much as digits as its factorization.

999981613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 944784, while the sum is 55.

The square root of 999981613 is about 31622.4858763507. The cubic root of 999981613 is about 999.9938709624.

The spelling of 999981613 in words is "nine hundred ninety-nine million, nine hundred eighty-one thousand, six hundred thirteen".