198420133 has 2 divisors, whose sum is σ = 198420134. Its totient is φ = 198420132.

The previous prime is 198420121. The next prime is 198420139. The reversal of 198420133 is 331024891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196616484 + 1803649 = 14022^2 + 1343^2 .

It is a cyclic number.

It is not a de Polignac number, because 198420133 - 2¹⁷ = 198289061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198420095 and 198420104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198420139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99210066 + 99210067.

It is an arithmetic number, because the mean of its divisors is an integer number (99210067).

Almost surely, 2^198420133 is an apocalyptic number.

It is an amenable number.

198420133 is a deficient number, since it is larger than the sum of its proper divisors (1).

198420133 is an equidigital number, since it uses as much as digits as its factorization.

198420133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 198420133 is about 14086.1681446730. The cubic root of 198420133 is about 583.2596221056.

The spelling of 198420133 in words is "one hundred ninety-eight million, four hundred twenty thousand, one hundred thirty-three".