99109409 has 6 divisors (see below), whose sum is σ = 115290594. Its totient is φ = 84950880.

The previous prime is 99109393. The next prime is 99109427. The reversal of 99109409 is 90490199.

It can be written as a sum of positive squares in only one way, i.e., 98803600 + 305809 = 9940^2 + 553^2 .

It is not a de Polignac number, because 99109409 - 2⁴ = 99109393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99109469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1011272 + ... + 1011369.

It is an arithmetic number, because the mean of its divisors is an integer number (19215099).

Almost surely, 2^99109409 is an apocalyptic number.

It is an amenable number.

99109409 is a deficient number, since it is larger than the sum of its proper divisors (16181185).

99109409 is a wasteful number, since it uses less digits than its factorization.

99109409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2022655 (or 2022648 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 99109409 is about 9955.3708620021. The cubic root of 99109409 is about 462.7768533800.

The spelling of 99109409 in words is "ninety-nine million, one hundred nine thousand, four hundred nine".