198155545 has 8 divisors (see below), whose sum is σ = 271756224. Its totient is φ = 135878064.

The previous prime is 198155527. The next prime is 198155561. The reversal of 198155545 is 545551891.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 198155545 - 2⁵ = 198155513 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2830759 + ... + 2830828.

It is an arithmetic number, because the mean of its divisors is an integer number (33969528).

Almost surely, 2^198155545 is an apocalyptic number.

It is an amenable number.

198155545 is a deficient number, since it is larger than the sum of its proper divisors (73600679).

198155545 is an equidigital number, since it uses as much as digits as its factorization.

198155545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5661599.

The product of its digits is 180000, while the sum is 43.

The square root of 198155545 is about 14076.7732453144. The cubic root of 198155545 is about 583.0002530237. Note that the first 3 decimals are identical.

The spelling of 198155545 in words is "one hundred ninety-eight million, one hundred fifty-five thousand, five hundred forty-five".