19817141 has 2 divisors, whose sum is σ = 19817142. Its totient is φ = 19817140.

The previous prime is 19817137. The next prime is 19817143. The reversal of 19817141 is 14171891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19802500 + 14641 = 4450^2 + 121^2 .

It is a cyclic number.

It is not a de Polignac number, because 19817141 - 2² = 19817137 is a prime.

Together with 19817143, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19817098 and 19817107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19817143) 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, 9908570 + 9908571.

It is an arithmetic number, because the mean of its divisors is an integer number (9908571).

Almost surely, 2^19817141 is an apocalyptic number.

It is an amenable number.

19817141 is a deficient number, since it is larger than the sum of its proper divisors (1).

19817141 is an equidigital number, since it uses as much as digits as its factorization.

19817141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 32.

The square root of 19817141 is about 4451.6447522236. The cubic root of 19817141 is about 270.6119680924.

The spelling of 19817141 in words is "nineteen million, eight hundred seventeen thousand, one hundred forty-one".