99897089 has 4 divisors (see below), whose sum is σ = 101590320. Its totient is φ = 98203860.

The previous prime is 99897013. The next prime is 99897107. The reversal of 99897089 is 98079899.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98079899 = 7817 ⋅12547.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99897089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (59), and also a Moran number because the ratio is a prime number: 1693171 = 99897089 / (9 + 9 + 8 + 9 + 7 + 0 + 8 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99897289) 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, 846527 + ... + 846644.

It is an arithmetic number, because the mean of its divisors is an integer number (25397580).

Almost surely, 2^99897089 is an apocalyptic number.

It is an amenable number.

99897089 is a deficient number, since it is larger than the sum of its proper divisors (1693231).

99897089 is a wasteful number, since it uses less digits than its factorization.

99897089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693230.

The product of its (nonzero) digits is 2939328, while the sum is 59.

The square root of 99897089 is about 9994.8531254841. The cubic root of 99897089 is about 463.9996051944. Note that the first 3 decimals are identical.

The spelling of 99897089 in words is "ninety-nine million, eight hundred ninety-seven thousand, eighty-nine".