99145209 has 4 divisors (see below), whose sum is σ = 132193616. Its totient is φ = 66096804.

The previous prime is 99145153. The next prime is 99145213. The reversal of 99145209 is 90254199.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 99145209 - 2⁸ = 99144953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99145219) 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, 16524199 + ... + 16524204.

It is an arithmetic number, because the mean of its divisors is an integer number (33048404).

Almost surely, 2^99145209 is an apocalyptic number.

It is an amenable number.

99145209 is a deficient number, since it is larger than the sum of its proper divisors (33048407).

99145209 is a wasteful number, since it uses less digits than its factorization.

99145209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33048406.

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 99145209 is about 9957.1687240902. The cubic root of 99145209 is about 462.8325676225.

The spelling of 99145209 in words is "ninety-nine million, one hundred forty-five thousand, two hundred nine".