9898787897 has 4 divisors (see below), whose sum is σ = 10481069556. Its totient is φ = 9316506240.

The previous prime is 9898787807. The next prime is 9898787981. The reversal of 9898787897 is 7987878989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7987878989 = 20261 ⋅394249.

It can be written as a sum of positive squares in 2 ways, for example, as 3264522496 + 6634265401 = 57136^2 + 81451^2 .

It is a cyclic number.

It is not a de Polignac number, because 9898787897 - 2¹⁰ = 9898786873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9898787807) 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 in 3 ways as a sum of consecutive naturals, for example, 291140804 + ... + 291140837.

It is an arithmetic number, because the mean of its divisors is an integer number (2620267389).

Almost surely, 2^9898787897 is an apocalyptic number.

It is an amenable number.

9898787897 is a deficient number, since it is larger than the sum of its proper divisors (582281659).

9898787897 is a wasteful number, since it uses less digits than its factorization.

9898787897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582281658.

The product of its digits is 1024192512, while the sum is 80.

The square root of 9898787897 is about 99492.6524774568. The cubic root of 9898787897 is about 2147.1415336942.

The spelling of 9898787897 in words is "nine billion, eight hundred ninety-eight million, seven hundred eighty-seven thousand, eight hundred ninety-seven".