9943109857 has 2 divisors, whose sum is σ = 9943109858. Its totient is φ = 9943109856.

The previous prime is 9943109851. The next prime is 9943109879. The reversal of 9943109857 is 7589013499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9784375056 + 158734801 = 98916^2 + 12599^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9943109857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9943109798 and 9943109807.

It is not a weakly prime, because it can be changed into another prime (9943109851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4971554928 + 4971554929.

It is an arithmetic number, because the mean of its divisors is an integer number (4971554929).

Almost surely, 2^9943109857 is an apocalyptic number.

It is an amenable number.

9943109857 is a deficient number, since it is larger than the sum of its proper divisors (1).

9943109857 is an equidigital number, since it uses as much as digits as its factorization.

9943109857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The square root of 9943109857 is about 99715.1435690688. The cubic root of 9943109857 is about 2150.3413813066.

The spelling of 9943109857 in words is "nine billion, nine hundred forty-three million, one hundred nine thousand, eight hundred fifty-seven".