99898009 has 2 divisors, whose sum is σ = 99898010. Its totient is φ = 99898008.

The previous prime is 99897997. The next prime is 99898031. The reversal of 99898009 is 90089899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87366409 + 12531600 = 9347^2 + 3540^2 .

It is a cyclic number.

It is not a de Polignac number, because 99898009 - 2⁵ = 99897977 is a prime.

It is a super-2 number, since 2×99898009² = 19959224404328162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99898079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49949004 + 49949005.

It is an arithmetic number, because the mean of its divisors is an integer number (49949005).

Almost surely, 2^99898009 is an apocalyptic number.

It is an amenable number.

99898009 is a deficient number, since it is larger than the sum of its proper divisors (1).

99898009 is an equidigital number, since it uses as much as digits as its factorization.

99898009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 52.

The square root of 99898009 is about 9994.8991490660. The cubic root of 99898009 is about 464.0010295880.

The spelling of 99898009 in words is "ninety-nine million, eight hundred ninety-eight thousand, nine".