198458421097 has 2 divisors, whose sum is σ = 198458421098. Its totient is φ = 198458421096.

The previous prime is 198458421067. The next prime is 198458421137. The reversal of 198458421097 is 790124854891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142639160976 + 55819260121 = 377676^2 + 236261^2 .

It is a cyclic number.

It is not a de Polignac number, because 198458421097 - 2²³ = 198450032489 is a prime.

It is not a weakly prime, because it can be changed into another prime (198458421037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99229210548 + 99229210549.

It is an arithmetic number, because the mean of its divisors is an integer number (99229210549).

Almost surely, 2^198458421097 is an apocalyptic number.

It is an amenable number.

198458421097 is a deficient number, since it is larger than the sum of its proper divisors (1).

198458421097 is an equidigital number, since it uses as much as digits as its factorization.

198458421097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5806080, while the sum is 58.

The spelling of 198458421097 in words is "one hundred ninety-eight billion, four hundred fifty-eight million, four hundred twenty-one thousand, ninety-seven".