99985409 has 2 divisors, whose sum is σ = 99985410. Its totient is φ = 99985408.

The previous prime is 99985397. The next prime is 99985423. The reversal of 99985409 is 90458999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94031809 + 5953600 = 9697^2 + 2440^2 .

It is a cyclic number.

It is not a de Polignac number, because 99985409 - 2⁸ = 99985153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99985489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49992704 + 49992705.

It is an arithmetic number, because the mean of its divisors is an integer number (49992705).

Almost surely, 2^99985409 is an apocalyptic number.

It is an amenable number.

99985409 is a deficient number, since it is larger than the sum of its proper divisors (1).

99985409 is an equidigital number, since it uses as much as digits as its factorization.

99985409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1049760, while the sum is 53.

The square root of 99985409 is about 9999.2704233859. The cubic root of 99985409 is about 464.1363071223.

The spelling of 99985409 in words is "ninety-nine million, nine hundred eighty-five thousand, four hundred nine".