198556143 has 4 divisors (see below), whose sum is σ = 264741528. Its totient is φ = 132370760.

The previous prime is 198556121. The next prime is 198556177. The reversal of 198556143 is 341655891.

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 198556143 - 2²⁰ = 197507567 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198556095 and 198556104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198556343) 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, 33092688 + ... + 33092693.

It is an arithmetic number, because the mean of its divisors is an integer number (66185382).

Almost surely, 2^198556143 is an apocalyptic number.

198556143 is a deficient number, since it is larger than the sum of its proper divisors (66185385).

198556143 is an equidigital number, since it uses as much as digits as its factorization.

198556143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66185384.

The product of its digits is 129600, while the sum is 42.

The square root of 198556143 is about 14090.9951032565. The cubic root of 198556143 is about 583.3928596306.

The spelling of 198556143 in words is "one hundred ninety-eight million, five hundred fifty-six thousand, one hundred forty-three".