99716509 has 8 divisors (see below), whose sum is σ = 106257528.
Its totient is φ = 93250560.
The previous prime is 99716501. The next prime is 99716521. The reversal of 99716509 is 90561799.
It can be written as a sum of positive squares in 4 ways, for example, as 25704900 + 74011609 = 5070^2 + 8603^2
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 99716509 - 23 = 99716501 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (99716501) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16012 + ... + 21349.
It is an arithmetic number, because the mean of its divisors is an integer number (13282191).
Almost surely, 299716509 is an apocalyptic number.
99716509 is the 5338-th nonagonal number.
It is an amenable number.
99716509 is a deficient number, since it is larger than the sum of its proper divisors (6541019).
99716509 is a wasteful number, since it uses less digits than its factorization.
99716509 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 37535.
The product of its (nonzero) digits is 153090, while the sum is 46.
The square root of 99716509 is about 9985.8153898417.
The cubic root of 99716509 is about 463.7198520081.
The spelling of 99716509 in words is "ninety-nine million, seven hundred sixteen thousand, five hundred nine".