198787543 has 4 divisors (see below), whose sum is σ = 199040920. Its totient is φ = 198534168.

The previous prime is 198787529. The next prime is 198787559. The reversal of 198787543 is 345787891.

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

It is a cyclic number.

It is not a de Polignac number, because 198787543 - 2²⁵ = 165233111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198787513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125508 + ... + 127081.

It is an arithmetic number, because the mean of its divisors is an integer number (49760230).

Almost surely, 2^198787543 is an apocalyptic number.

198787543 is a deficient number, since it is larger than the sum of its proper divisors (253377).

198787543 is an equidigital number, since it uses as much as digits as its factorization.

198787543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253376.

The product of its digits is 1693440, while the sum is 52.

The square root of 198787543 is about 14099.2036299927. The cubic root of 198787543 is about 583.6194029433.

The spelling of 198787543 in words is "one hundred ninety-eight million, seven hundred eighty-seven thousand, five hundred forty-three".