19489021851041 has 2 divisors, whose sum is σ = 19489021851042. Its totient is φ = 19489021851040.

The previous prime is 19489021850957. The next prime is 19489021851043. The reversal of 19489021851041 is 14015812098491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12705809959441 + 6783211891600 = 3564521^2 + 2604460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19489021851041 is a prime.

It is a Sophie Germain prime.

Together with 19489021851043, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19489021851043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9744510925520 + 9744510925521.

It is an arithmetic number, because the mean of its divisors is an integer number (9744510925521).

Almost surely, 2^{19489021851041} is an apocalyptic number.

It is an amenable number.

19489021851041 is a deficient number, since it is larger than the sum of its proper divisors (1).

19489021851041 is an equidigital number, since it uses as much as digits as its factorization.

19489021851041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 53.

The spelling of 19489021851041 in words is "nineteen trillion, four hundred eighty-nine billion, twenty-one million, eight hundred fifty-one thousand, forty-one".