198549523 has 4 divisors (see below), whose sum is σ = 199490728. Its totient is φ = 197608320.

The previous prime is 198549517. The next prime is 198549539. The reversal of 198549523 is 325945891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198549523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198549223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 470286 + ... + 470707.

It is an arithmetic number, because the mean of its divisors is an integer number (49872682).

Almost surely, 2^198549523 is an apocalyptic number.

198549523 is a deficient number, since it is larger than the sum of its proper divisors (941205).

198549523 is an equidigital number, since it uses as much as digits as its factorization.

198549523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941204.

The product of its digits is 388800, while the sum is 46.

The square root of 198549523 is about 14090.7601995066. The cubic root of 198549523 is about 583.3863759839.

The spelling of 198549523 in words is "one hundred ninety-eight million, five hundred forty-nine thousand, five hundred twenty-three".