99985009 has 2 divisors, whose sum is σ = 99985010. Its totient is φ = 99985008.

The previous prime is 99984991. The next prime is 99985021. The reversal of 99985009 is 90058999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78269409 + 21715600 = 8847^2 + 4660^2 .

It is a cyclic number.

It is not a de Polignac number, because 99985009 - 2¹³ = 99976817 is a prime.

It is not a weakly prime, because it can be changed into another prime (99985099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49992504 + 49992505.

It is an arithmetic number, because the mean of its divisors is an integer number (49992505).

Almost surely, 2^99985009 is an apocalyptic number.

It is an amenable number.

99985009 is a deficient number, since it is larger than the sum of its proper divisors (1).

99985009 is an equidigital number, since it uses as much as digits as its factorization.

99985009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 49.

The square root of 99985009 is about 9999.2504219066. The cubic root of 99985009 is about 464.1356881828.

The spelling of 99985009 in words is "ninety-nine million, nine hundred eighty-five thousand, nine".