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19697 is a prime number
BaseRepresentation
bin100110011110001
31000000112
410303301
51112242
6231105
7111266
oct46361
930015
1019697
1113887
12b495
138c72
14726d
155c82
hex4cf1

19697 has 2 divisors, whose sum is σ = 19698. Its totient is φ = 19696.

The previous prime is 19687. The next prime is 19699. The reversal of 19697 is 79691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13456 + 6241 = 116^2 + 79^2 .

It is an emirp because it is prime and its reverse (79691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19697 - 24 = 19681 is a prime.

Together with 19699, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 7.

It is not a weakly prime, because it can be changed into another prime (19699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9848 + 9849.

It is an arithmetic number, because the mean of its divisors is an integer number (9849).

219697 is an apocalyptic number.

It is an amenable number.

19697 is a deficient number, since it is larger than the sum of its proper divisors (1).

19697 is an equidigital number, since it uses as much as digits as its factorization.

19697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402, while the sum is 32.

The square root of 19697 is about 140.3460010118. The cubic root of 19697 is about 27.0063999461.

The spelling of 19697 in words is "nineteen thousand, six hundred ninety-seven".