999981475793 has 2 divisors, whose sum is σ = 999981475794. Its totient is φ = 999981475792.

The previous prime is 999981475789. The next prime is 999981475799. The reversal of 999981475793 is 397574189999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 998424620944 + 1556854849 = 999212^2 + 39457^2 .

It is a cyclic number.

It is not a de Polignac number, because 999981475793 - 2² = 999981475789 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (999981475799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499990737896 + 499990737897.

It is an arithmetic number, because the mean of its divisors is an integer number (499990737897).

Almost surely, 2^999981475793 is an apocalyptic number.

It is an amenable number.

999981475793 is a deficient number, since it is larger than the sum of its proper divisors (1).

999981475793 is an equidigital number, since it uses as much as digits as its factorization.

999981475793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1388832480, while the sum is 80.

The spelling of 999981475793 in words is "nine hundred ninety-nine billion, nine hundred eighty-one million, four hundred seventy-five thousand, seven hundred ninety-three".