198651231017 has 2 divisors, whose sum is σ = 198651231018. Its totient is φ = 198651231016.

The previous prime is 198651231007. The next prime is 198651231043. The reversal of 198651231017 is 710132156891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196227736576 + 2423494441 = 442976^2 + 49229^2 .

It is an emirp because it is prime and its reverse (710132156891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198651231017 - 2⁴ = 198651231001 is a prime.

It is not a weakly prime, because it can be changed into another prime (198651231007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99325615508 + 99325615509.

It is an arithmetic number, because the mean of its divisors is an integer number (99325615509).

Almost surely, 2^198651231017 is an apocalyptic number.

It is an amenable number.

198651231017 is a deficient number, since it is larger than the sum of its proper divisors (1).

198651231017 is an equidigital number, since it uses as much as digits as its factorization.

198651231017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 44.

The spelling of 198651231017 in words is "one hundred ninety-eight billion, six hundred fifty-one million, two hundred thirty-one thousand, seventeen".