99998897 has 4 divisors (see below), whose sum is σ = 100517220. Its totient is φ = 99480576.

The previous prime is 99998891. The next prime is 99998909. The reversal of 99998897 is 79889999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79889999 = 7 ⋅11412857.

It can be written as a sum of positive squares in 2 ways, for example, as 32364721 + 67634176 = 5689^2 + 8224^2 .

It is a cyclic number.

It is not a de Polignac number, because 99998897 - 2¹⁰ = 99997873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99998891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258872 + ... + 259257.

It is an arithmetic number, because the mean of its divisors is an integer number (25129305).

Almost surely, 2^99998897 is an apocalyptic number.

It is an amenable number.

99998897 is a deficient number, since it is larger than the sum of its proper divisors (518323).

99998897 is a wasteful number, since it uses less digits than its factorization.

99998897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518322.

The product of its digits is 26453952, while the sum is 68.

The square root of 99998897 is about 9999.9448498479. The cubic root of 99998897 is about 464.1571767975.

The spelling of 99998897 in words is "ninety-nine million, nine hundred ninety-eight thousand, eight hundred ninety-seven".