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19309919 is a prime number
BaseRepresentation
bin100100110101…
…0010101011111
31100100001020012
41021222111133
514420404134
61525513435
7323063066
oct111522537
940301205
1019309919
11a999912
12657287b
1340012b5
1427c91dd
151a666ce
hex126a55f

19309919 has 2 divisors, whose sum is σ = 19309920. Its totient is φ = 19309918.

The previous prime is 19309889. The next prime is 19309921. The reversal of 19309919 is 91990391.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19309919 - 28 = 19309663 is a prime.

It is a super-3 number, since 3×193099193 (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

Together with 19309921, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19309019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9654959 + 9654960.

It is an arithmetic number, because the mean of its divisors is an integer number (9654960).

Almost surely, 219309919 is an apocalyptic number.

19309919 is a deficient number, since it is larger than the sum of its proper divisors (1).

19309919 is an equidigital number, since it uses as much as digits as its factorization.

19309919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19683, while the sum is 41.

The square root of 19309919 is about 4394.3052920797. The cubic root of 19309919 is about 268.2832038174.

The spelling of 19309919 in words is "nineteen million, three hundred nine thousand, nine hundred nineteen".