91000099000043 has 2 divisors, whose sum is σ = 91000099000044. Its totient is φ = 91000099000042.

The previous prime is 91000099000007. The next prime is 91000099000061. The reversal of 91000099000043 is 34000099000019.

It is a strong prime.

It is an emirp because it is prime and its reverse (34000099000019) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91000099000043 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 91000098999967 and 91000099000012.

It is not a weakly prime, because it can be changed into another prime (91000099005043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45500049500021 + 45500049500022.

It is an arithmetic number, because the mean of its divisors is an integer number (45500049500022).

Almost surely, 2^{91000099000043} is an apocalyptic number.

91000099000043 is a deficient number, since it is larger than the sum of its proper divisors (1).

91000099000043 is an equidigital number, since it uses as much as digits as its factorization.

91000099000043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 35.

The spelling of 91000099000043 in words is "ninety-one trillion, ninety-nine million, forty-three", and thus it is an aban number and an uban number.