198611317 has 2 divisors, whose sum is σ = 198611318. Its totient is φ = 198611316.

The previous prime is 198611269. The next prime is 198611321. The reversal of 198611317 is 713116891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192265956 + 6345361 = 13866^2 + 2519^2 .

It is an emirp because it is prime and its reverse (713116891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198611317 - 2²³ = 190222709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198611377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99305658 + 99305659.

It is an arithmetic number, because the mean of its divisors is an integer number (99305659).

Almost surely, 2^198611317 is an apocalyptic number.

It is an amenable number.

198611317 is a deficient number, since it is larger than the sum of its proper divisors (1).

198611317 is an equidigital number, since it uses as much as digits as its factorization.

198611317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 37.

The square root of 198611317 is about 14092.9527424170. The cubic root of 198611317 is about 583.4468915972.

The spelling of 198611317 in words is "one hundred ninety-eight million, six hundred eleven thousand, three hundred seventeen".