989888569 has 2 divisors, whose sum is σ = 989888570. Its totient is φ = 989888568.

The previous prime is 989888567. The next prime is 989888591. The reversal of 989888569 is 965888989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 970634025 + 19254544 = 31155^2 + 4388^2 .

It is a cyclic number.

It is not a de Polignac number, because 989888569 - 2¹ = 989888567 is a prime.

It is a super-2 number, since 2×989888569² = 1959758758073735522, which contains 22 as substring.

Together with 989888567, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 989888498 and 989888507.

It is not a weakly prime, because it can be changed into another prime (989888561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494944284 + 494944285.

It is an arithmetic number, because the mean of its divisors is an integer number (494944285).

Almost surely, 2^989888569 is an apocalyptic number.

It is an amenable number.

989888569 is a deficient number, since it is larger than the sum of its proper divisors (1).

989888569 is an equidigital number, since it uses as much as digits as its factorization.

989888569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 89579520, while the sum is 70.

The square root of 989888569 is about 31462.4946404445. The cubic root of 989888569 is about 996.6180986364.

The spelling of 989888569 in words is "nine hundred eighty-nine million, eight hundred eighty-eight thousand, five hundred sixty-nine".