9815142443 has 2 divisors, whose sum is σ = 9815142444. Its totient is φ = 9815142442.

The previous prime is 9815142439. The next prime is 9815142487. The reversal of 9815142443 is 3442415189.

It is a weak prime.

It is an emirp because it is prime and its reverse (3442415189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9815142443 - 2² = 9815142439 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9815142443.

It is not a weakly prime, because it can be changed into another prime (9815142413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4907571221 + 4907571222.

It is an arithmetic number, because the mean of its divisors is an integer number (4907571222).

Almost surely, 2^9815142443 is an apocalyptic number.

9815142443 is a deficient number, since it is larger than the sum of its proper divisors (1).

9815142443 is an equidigital number, since it uses as much as digits as its factorization.

9815142443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 41.

The square root of 9815142443 is about 99071.4007319973. The cubic root of 9815142443 is about 2141.0765860724.

The spelling of 9815142443 in words is "nine billion, eight hundred fifteen million, one hundred forty-two thousand, four hundred forty-three".