9898971427 has 2 divisors, whose sum is σ = 9898971428. Its totient is φ = 9898971426.

The previous prime is 9898971419. The next prime is 9898971431. The reversal of 9898971427 is 7241798989.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9898971427 - 2³ = 9898971419 is a prime.

It is not a weakly prime, because it can be changed into another prime (9898971437) 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, 4949485713 + 4949485714.

It is an arithmetic number, because the mean of its divisors is an integer number (4949485714).

Almost surely, 2^9898971427 is an apocalyptic number.

9898971427 is a deficient number, since it is larger than the sum of its proper divisors (1).

9898971427 is an equidigital number, since it uses as much as digits as its factorization.

9898971427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18289152, while the sum is 64.

The square root of 9898971427 is about 99493.5748025972. The cubic root of 9898971427 is about 2147.1548034149.

The spelling of 9898971427 in words is "nine billion, eight hundred ninety-eight million, nine hundred seventy-one thousand, four hundred twenty-seven".