108198509 has 4 divisors (see below), whose sum is σ = 112902816. Its totient is φ = 103494204.

The previous prime is 108198491. The next prime is 108198527. The reversal of 108198509 is 905891801.

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, and also an emirpimes, since its reverse is a distinct semiprime: 905891801 = 17 ⋅53287753.

It is an interprime number because it is at equal distance from previous prime (108198491) and next prime (108198527).

It is a de Polignac number, because none of the positive numbers 2^k-108198509 is a prime.

It is a super-3 number, since 3×108198509³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108198529) 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, 2352119 + ... + 2352164.

It is an arithmetic number, because the mean of its divisors is an integer number (28225704).

Almost surely, 2^108198509 is an apocalyptic number.

It is an amenable number.

108198509 is a deficient number, since it is larger than the sum of its proper divisors (4704307).

108198509 is an equidigital number, since it uses as much as digits as its factorization.

108198509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4704306.

The product of its (nonzero) digits is 25920, while the sum is 41.

The square root of 108198509 is about 10401.8512294687. The cubic root of 108198509 is about 476.5119086719.

The spelling of 108198509 in words is "one hundred eight million, one hundred ninety-eight thousand, five hundred nine".