198097993 has 2 divisors, whose sum is σ = 198097994. Its totient is φ = 198097992.

The previous prime is 198097973. The next prime is 198098039. The reversal of 198097993 is 399790891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197346304 + 751689 = 14048^2 + 867^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198097993 is a prime.

It is not a weakly prime, because it can be changed into another prime (198097973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99048996 + 99048997.

It is an arithmetic number, because the mean of its divisors is an integer number (99048997).

Almost surely, 2^198097993 is an apocalyptic number.

It is an amenable number.

198097993 is a deficient number, since it is larger than the sum of its proper divisors (1).

198097993 is an equidigital number, since it uses as much as digits as its factorization.

198097993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1102248, while the sum is 55.

The square root of 198097993 is about 14074.7288783834. The cubic root of 198097993 is about 582.9438056514.

The spelling of 198097993 in words is "one hundred ninety-eight million, ninety-seven thousand, nine hundred ninety-three".