98720009 has 2 divisors, whose sum is σ = 98720010. Its totient is φ = 98720008.

The previous prime is 98719997. The next prime is 98720023. The reversal of 98720009 is 90002789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97081609 + 1638400 = 9853^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 98720009 - 2⁴ = 98719993 is a prime.

It is not a weakly prime, because it can be changed into another prime (98729009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49360004 + 49360005.

It is an arithmetic number, because the mean of its divisors is an integer number (49360005).

Almost surely, 2^98720009 is an apocalyptic number.

It is an amenable number.

98720009 is a deficient number, since it is larger than the sum of its proper divisors (1).

98720009 is an equidigital number, since it uses as much as digits as its factorization.

98720009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 98720009 is about 9935.7943316073. The cubic root of 98720009 is about 462.1699758111.

The spelling of 98720009 in words is "ninety-eight million, seven hundred twenty thousand, nine".