1000999999943 has 2 divisors, whose sum is σ = 1000999999944. Its totient is φ = 1000999999942.

The previous prime is 1000999999913. The next prime is 1001000000017. The reversal of 1000999999943 is 3499999990001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1000999999943 - 2²⁰ = 1000998951367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000999999913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500499999971 + 500499999972.

It is an arithmetic number, because the mean of its divisors is an integer number (500499999972).

Almost surely, 2^{1000999999943} is an apocalyptic number.

1000999999943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000999999943 is an equidigital number, since it uses as much as digits as its factorization.

1000999999943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57395628, while the sum is 71.

The spelling of 1000999999943 in words is "one trillion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred forty-three".