198545891 has 8 divisors (see below), whose sum is σ = 201740544. Its totient is φ = 195362440.

The previous prime is 198545887. The next prime is 198545923.

198545891 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 198545891 - 2² = 198545887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198541891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37490 + ... + 42456.

It is an arithmetic number, because the mean of its divisors is an integer number (25217568).

Almost surely, 2^198545891 is an apocalyptic number.

198545891 is a deficient number, since it is larger than the sum of its proper divisors (3194653).

198545891 is an equidigital number, since it uses as much as digits as its factorization.

198545891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5601.

The product of its digits is 518400, while the sum is 50.

The square root of 198545891 is about 14090.6313201361. The cubic root of 198545891 is about 583.3828187316.

The spelling of 198545891 in words is "one hundred ninety-eight million, five hundred forty-five thousand, eight hundred ninety-one".