1619083947821 has 2 divisors, whose sum is σ = 1619083947822. Its totient is φ = 1619083947820.

The previous prime is 1619083947797. The next prime is 1619083947841. The reversal of 1619083947821 is 1287493809161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1418076088900 + 201007858921 = 1190830^2 + 448339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1619083947821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1619083947841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 809541973910 + 809541973911.

It is an arithmetic number, because the mean of its divisors is an integer number (809541973911).

Almost surely, 2^{1619083947821} is an apocalyptic number.

It is an amenable number.

1619083947821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1619083947821 is an equidigital number, since it uses as much as digits as its factorization.

1619083947821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5225472, while the sum is 59.

The spelling of 1619083947821 in words is "one trillion, six hundred nineteen billion, eighty-three million, nine hundred forty-seven thousand, eight hundred twenty-one".