198317617 has 2 divisors, whose sum is σ = 198317618. Its totient is φ = 198317616.

The previous prime is 198317593. The next prime is 198317653. The reversal of 198317617 is 716713891.

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., 197233936 + 1083681 = 14044^2 + 1041^2 .

It is a cyclic number.

It is not a de Polignac number, because 198317617 - 2⁷ = 198317489 is a prime.

It is not a weakly prime, because it can be changed into another prime (198317417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99158808 + 99158809.

It is an arithmetic number, because the mean of its divisors is an integer number (99158809).

Almost surely, 2^198317617 is an apocalyptic number.

It is an amenable number.

198317617 is a deficient number, since it is larger than the sum of its proper divisors (1).

198317617 is an equidigital number, since it uses as much as digits as its factorization.

198317617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 43.

The square root of 198317617 is about 14082.5287856975. The cubic root of 198317617 is about 583.1591555801.

It can be divided in two parts, 1983 and 17617, that added together give a square (19600 = 140²).

The spelling of 198317617 in words is "one hundred ninety-eight million, three hundred seventeen thousand, six hundred seventeen".