198097877 has 2 divisors, whose sum is σ = 198097878. Its totient is φ = 198097876.

The previous prime is 198097859. The next prime is 198097897. The reversal of 198097877 is 778790891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158734801 + 39363076 = 12599^2 + 6274^2 .

It is a cyclic number.

It is not a de Polignac number, because 198097877 - 2¹⁴ = 198081493 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 (198097847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99048938 + 99048939.

It is an arithmetic number, because the mean of its divisors is an integer number (99048939).

Almost surely, 2^198097877 is an apocalyptic number.

It is an amenable number.

198097877 is a deficient number, since it is larger than the sum of its proper divisors (1).

198097877 is an equidigital number, since it uses as much as digits as its factorization.

198097877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1778112, while the sum is 56.

The square root of 198097877 is about 14074.7247575219. The cubic root of 198097877 is about 582.9436918668.

The spelling of 198097877 in words is "one hundred ninety-eight million, ninety-seven thousand, eight hundred seventy-seven".