89899099897 has 2 divisors, whose sum is σ = 89899099898. Its totient is φ = 89899099896.

The previous prime is 89899099889. The next prime is 89899099907. The reversal of 89899099897 is 79899099898.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71732373241 + 18166726656 = 267829^2 + 134784^2 .

It is a cyclic number.

It is not a de Polignac number, because 89899099897 - 2³ = 89899099889 is a prime.

It is not a weakly prime, because it can be changed into another prime (89899099877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44949549948 + 44949549949.

It is an arithmetic number, because the mean of its divisors is an integer number (44949549949).

Almost surely, 2^89899099897 is an apocalyptic number.

It is an amenable number.

89899099897 is a deficient number, since it is larger than the sum of its proper divisors (1).

89899099897 is an equidigital number, since it uses as much as digits as its factorization.

89899099897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1904684544, while the sum is 85.

Subtracting from 89899099897 its reverse (79899099898), we obtain a palindrome (9999999999).

The spelling of 89899099897 in words is "eighty-nine billion, eight hundred ninety-nine million, ninety-nine thousand, eight hundred ninety-seven".