989897697 has 6 divisors (see below), whose sum is σ = 1429852242. Its totient is φ = 659931792.

The previous prime is 989897683. The next prime is 989897749. The reversal of 989897697 is 796798989.

It can be written as a sum of positive squares in only one way, i.e., 885122001 + 104775696 = 29751^2 + 10236^2 .

It is not a de Polignac number, because 989897697 - 2⁴ = 989897681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (989897627) 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 5 ways as a sum of consecutive naturals, for example, 54994308 + ... + 54994325.

It is an arithmetic number, because the mean of its divisors is an integer number (238308707).

Almost surely, 2^989897697 is an apocalyptic number.

It is an amenable number.

989897697 is a deficient number, since it is larger than the sum of its proper divisors (439954545).

989897697 is a wasteful number, since it uses less digits than its factorization.

989897697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109988639 (or 109988636 counting only the distinct ones).

The product of its digits is 123451776, while the sum is 72.

The square root of 989897697 is about 31462.6397017161. The cubic root of 989897697 is about 996.6211619785.

The spelling of 989897697 in words is "nine hundred eighty-nine million, eight hundred ninety-seven thousand, six hundred ninety-seven".