9815422879 has 2 divisors, whose sum is σ = 9815422880. Its totient is φ = 9815422878.

The previous prime is 9815422873. The next prime is 9815422913. The reversal of 9815422879 is 9782245189.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9815422879 - 2⁹ = 9815422367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9815422873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4907711439 + 4907711440.

It is an arithmetic number, because the mean of its divisors is an integer number (4907711440).

Almost surely, 2^9815422879 is an apocalyptic number.

9815422879 is a deficient number, since it is larger than the sum of its proper divisors (1).

9815422879 is an equidigital number, since it uses as much as digits as its factorization.

9815422879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 55.

The square root of 9815422879 is about 99072.8160445639. The cubic root of 9815422879 is about 2141.0969773280.

The spelling of 9815422879 in words is "nine billion, eight hundred fifteen million, four hundred twenty-two thousand, eight hundred seventy-nine".