99999404509 has 2 divisors, whose sum is σ = 99999404510. Its totient is φ = 99999404508.

The previous prime is 99999404503. The next prime is 99999404537. The reversal of 99999404509 is 90540499999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84901138884 + 15098265625 = 291378^2 + 122875^2 .

It is a cyclic number.

It is not a de Polignac number, because 99999404509 - 2²¹ = 99997307357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99999404503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999702254 + 49999702255.

It is an arithmetic number, because the mean of its divisors is an integer number (49999702255).

Almost surely, 2^99999404509 is an apocalyptic number.

It is an amenable number.

99999404509 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999404509 is an equidigital number, since it uses as much as digits as its factorization.

99999404509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42515280, while the sum is 67.

The spelling of 99999404509 in words is "ninety-nine billion, nine hundred ninety-nine million, four hundred four thousand, five hundred nine".