198109515 has 16 divisors (see below), whose sum is σ = 317150496. Its totient is φ = 105600000.

The previous prime is 198109481. The next prime is 198109519. The reversal of 198109515 is 515901891.

It is not a de Polignac number, because 198109515 - 2⁶ = 198109451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198109519) 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 15 ways as a sum of consecutive naturals, for example, 47515 + ... + 51515.

It is an arithmetic number, because the mean of its divisors is an integer number (19821906).

Almost surely, 2^198109515 is an apocalyptic number.

198109515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

198109515 is a deficient number, since it is larger than the sum of its proper divisors (119040981).

198109515 is a wasteful number, since it uses less digits than its factorization.

198109515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7310.

The product of its (nonzero) digits is 16200, while the sum is 39.

The square root of 198109515 is about 14075.1381875987. The cubic root of 198109515 is about 582.9551073784.

The spelling of 198109515 in words is "one hundred ninety-eight million, one hundred nine thousand, five hundred fifteen".