989616109 has 2 divisors, whose sum is σ = 989616110. Its totient is φ = 989616108.

The previous prime is 989616091. The next prime is 989616119. The reversal of 989616109 is 901616989.

Together with previous prime (989616091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 989291209 + 324900 = 31453^2 + 570^2 .

It is a cyclic number.

It is not a de Polignac number, because 989616109 - 2⁵ = 989616077 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989616119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494808054 + 494808055.

It is an arithmetic number, because the mean of its divisors is an integer number (494808055).

Almost surely, 2^989616109 is an apocalyptic number.

It is an amenable number.

989616109 is a deficient number, since it is larger than the sum of its proper divisors (1).

989616109 is an equidigital number, since it uses as much as digits as its factorization.

989616109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 989616109 is about 31458.1644251536. The cubic root of 989616109 is about 996.5266528271.

The spelling of 989616109 in words is "nine hundred eighty-nine million, six hundred sixteen thousand, one hundred nine".