9999855143 has 2 divisors, whose sum is σ = 9999855144. Its totient is φ = 9999855142.

The previous prime is 9999855137. The next prime is 9999855149. The reversal of 9999855143 is 3415589999.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (9999855137) and next prime (9999855149).

It is a cyclic number.

It is not a de Polignac number, because 9999855143 - 2⁴ = 9999855127 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999855149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999927571 + 4999927572.

It is an arithmetic number, because the mean of its divisors is an integer number (4999927572).

Almost surely, 2^9999855143 is an apocalyptic number.

9999855143 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999855143 is an equidigital number, since it uses as much as digits as its factorization.

9999855143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15746400, while the sum is 62.

The square root of 9999855143 is about 99999.2757123770. The cubic root of 9999855143 is about 2154.4242871501.

The spelling of 9999855143 in words is "nine billion, nine hundred ninety-nine million, eight hundred fifty-five thousand, one hundred forty-three".