198278797 has 2 divisors, whose sum is σ = 198278798. Its totient is φ = 198278796.

The previous prime is 198278753. The next prime is 198278807. The reversal of 198278797 is 797872891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124679556 + 73599241 = 11166^2 + 8579^2 .

It is an emirp because it is prime and its reverse (797872891) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198278797 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 (198278897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99139398 + 99139399.

It is an arithmetic number, because the mean of its divisors is an integer number (99139399).

Almost surely, 2^198278797 is an apocalyptic number.

It is an amenable number.

198278797 is a deficient number, since it is larger than the sum of its proper divisors (1).

198278797 is an equidigital number, since it uses as much as digits as its factorization.

198278797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3556224, while the sum is 58.

The square root of 198278797 is about 14081.1504146501. The cubic root of 198278797 is about 583.1211026224.

The spelling of 198278797 in words is "one hundred ninety-eight million, two hundred seventy-eight thousand, seven hundred ninety-seven".