1999611793 has 2 divisors, whose sum is σ = 1999611794. Its totient is φ = 1999611792.

The previous prime is 1999611767. The next prime is 1999611841. The reversal of 1999611793 is 3971169991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1337218624 + 662393169 = 36568^2 + 25737^2 .

It is an emirp because it is prime and its reverse (3971169991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1999611793 - 2²¹ = 1997514641 is a prime.

It is not a weakly prime, because it can be changed into another prime (1999611703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999805896 + 999805897.

It is an arithmetic number, because the mean of its divisors is an integer number (999805897).

Almost surely, 2^1999611793 is an apocalyptic number.

It is an amenable number.

1999611793 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999611793 is an equidigital number, since it uses as much as digits as its factorization.

1999611793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 826686, while the sum is 55.

The square root of 1999611793 is about 44717.0190531525. The cubic root of 1999611793 is about 1259.8395262581.

The spelling of 1999611793 in words is "one billion, nine hundred ninety-nine million, six hundred eleven thousand, seven hundred ninety-three".