19819141 has 2 divisors, whose sum is σ = 19819142. Its totient is φ = 19819140.

The previous prime is 19819139. The next prime is 19819171. The reversal of 19819141 is 14191891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19802500 + 16641 = 4450^2 + 129^2 .

It is a cyclic number.

It is not a de Polignac number, because 19819141 - 2¹ = 19819139 is a prime.

Together with 19819139, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 19819097 and 19819106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19819171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9909570 + 9909571.

It is an arithmetic number, because the mean of its divisors is an integer number (9909571).

Almost surely, 2^19819141 is an apocalyptic number.

It is an amenable number.

19819141 is a deficient number, since it is larger than the sum of its proper divisors (1).

19819141 is an equidigital number, since it uses as much as digits as its factorization.

19819141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 34.

The square root of 19819141 is about 4451.8693826302. The cubic root of 19819141 is about 270.6210714192.

The spelling of 19819141 in words is "nineteen million, eight hundred nineteen thousand, one hundred forty-one".