99573409 has 4 divisors (see below), whose sum is σ = 107232916. Its totient is φ = 91913904.

The previous prime is 99573407. The next prime is 99573421. The reversal of 99573409 is 90437599.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26419600 + 73153809 = 5140^2 + 8553^2 .

It is a cyclic number.

It is not a de Polignac number, because 99573409 - 2¹ = 99573407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99573407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3829734 + ... + 3829759.

It is an arithmetic number, because the mean of its divisors is an integer number (26808229).

Almost surely, 2^99573409 is an apocalyptic number.

It is an amenable number.

99573409 is a deficient number, since it is larger than the sum of its proper divisors (7659507).

99573409 is a wasteful number, since it uses less digits than its factorization.

99573409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7659506.

The product of its (nonzero) digits is 306180, while the sum is 46.

The square root of 99573409 is about 9978.6476538657. The cubic root of 99573409 is about 463.4979225946.

It can be divided in two parts, 9957 and 3409, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 99573409 in words is "ninety-nine million, five hundred seventy-three thousand, four hundred nine".