9900000043 has 2 divisors, whose sum is σ = 9900000044. Its totient is φ = 9900000042.

The previous prime is 9900000029. The next prime is 9900000079. The reversal of 9900000043 is 3400000099.

It is a weak prime.

It is an emirp because it is prime and its reverse (3400000099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9900000043 - 2¹³ = 9899991851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9899999963 and 9900000017.

It is not a weakly prime, because it can be changed into another prime (9900000083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4950000021 + 4950000022.

It is an arithmetic number, because the mean of its divisors is an integer number (4950000022).

Almost surely, 2^9900000043 is an apocalyptic number.

9900000043 is a deficient number, since it is larger than the sum of its proper divisors (1).

9900000043 is an equidigital number, since it uses as much as digits as its factorization.

9900000043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 9900000043 is about 99498.7439267451. The cubic root of 9900000043 is about 2147.2291721277.

The spelling of 9900000043 in words is "nine billion, nine hundred million, forty-three", and thus it is an aban number.