198618941 has 4 divisors (see below), whose sum is σ = 205467900. Its totient is φ = 191769984.

The previous prime is 198618929. The next prime is 198618943. The reversal of 198618941 is 149816891.

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

It can be written as a sum of positive squares in 2 ways, for example, as 60062500 + 138556441 = 7750^2 + 11771^2 .

It is a cyclic number.

It is not a de Polignac number, because 198618941 - 2¹⁰ = 198617917 is a prime.

It is a super-2 number, since 2×198618941² = 78898967447922962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198618943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3424436 + ... + 3424493.

It is an arithmetic number, because the mean of its divisors is an integer number (51366975).

Almost surely, 2^198618941 is an apocalyptic number.

It is an amenable number.

198618941 is a deficient number, since it is larger than the sum of its proper divisors (6848959).

198618941 is an equidigital number, since it uses as much as digits as its factorization.

198618941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6848958.

The product of its digits is 124416, while the sum is 47.

The square root of 198618941 is about 14093.2232296235. The cubic root of 198618941 is about 583.4543570030.

The spelling of 198618941 in words is "one hundred ninety-eight million, six hundred eighteen thousand, nine hundred forty-one".