98638009 has 2 divisors, whose sum is σ = 98638010. Its totient is φ = 98638008.

The previous prime is 98637991. The next prime is 98638013. The reversal of 98638009 is 90083689.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65610000 + 33028009 = 8100^2 + 5747^2 .

It is a cyclic number.

It is not a de Polignac number, because 98638009 - 2⁵ = 98637977 is a prime.

It is not a weakly prime, because it can be changed into another prime (98638079) 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 as a sum of consecutive naturals, namely, 49319004 + 49319005.

It is an arithmetic number, because the mean of its divisors is an integer number (49319005).

Almost surely, 2^98638009 is an apocalyptic number.

It is an amenable number.

98638009 is a deficient number, since it is larger than the sum of its proper divisors (1).

98638009 is an equidigital number, since it uses as much as digits as its factorization.

98638009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 98638009 is about 9931.6669799183. Note that the first 3 decimals coincide. The cubic root of 98638009 is about 462.0419759716.

The spelling of 98638009 in words is "ninety-eight million, six hundred thirty-eight thousand, nine".