Search a number
-
+
989898809 is a prime number
BaseRepresentation
bin111011000000001…
…010100000111001
32112222200001212212
4323000022200321
54011403230214
6242120544505
733350000234
oct7300124071
92488601785
10989898809
11468854699
12237622135
1312a111553
149567c41b
155bd8853e
hex3b00a839

989898809 has 2 divisors, whose sum is σ = 989898810. Its totient is φ = 989898808.

The previous prime is 989898781. The next prime is 989898821. The reversal of 989898809 is 908898989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 504137209 + 485761600 = 22453^2 + 22040^2 .

It is an emirp because it is prime and its reverse (908898989) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-989898809 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (989898839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494949404 + 494949405.

It is an arithmetic number, because the mean of its divisors is an integer number (494949405).

Almost surely, 2989898809 is an apocalyptic number.

It is an amenable number.

989898809 is a deficient number, since it is larger than the sum of its proper divisors (1).

989898809 is an equidigital number, since it uses as much as digits as its factorization.

989898809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26873856, while the sum is 68.

The square root of 989898809 is about 31462.6573734642. The cubic root of 989898809 is about 996.6215351626.

The spelling of 989898809 in words is "nine hundred eighty-nine million, eight hundred ninety-eight thousand, eight hundred nine".