198930917 has 2 divisors, whose sum is σ = 198930918. Its totient is φ = 198930916.

The previous prime is 198930881. The next prime is 198930961. The reversal of 198930917 is 719039891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172160641 + 26770276 = 13121^2 + 5174^2 .

It is a cyclic number.

It is not a de Polignac number, because 198930917 - 2⁸ = 198930661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198330917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99465458 + 99465459.

It is an arithmetic number, because the mean of its divisors is an integer number (99465459).

Almost surely, 2^198930917 is an apocalyptic number.

It is an amenable number.

198930917 is a deficient number, since it is larger than the sum of its proper divisors (1).

198930917 is an equidigital number, since it uses as much as digits as its factorization.

198930917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 47.

The square root of 198930917 is about 14104.2871851079. The cubic root of 198930917 is about 583.7596795727.

The spelling of 198930917 in words is "one hundred ninety-eight million, nine hundred thirty thousand, nine hundred seventeen".