198120553 has 2 divisors, whose sum is σ = 198120554. Its totient is φ = 198120552.

The previous prime is 198120521. The next prime is 198120623. The reversal of 198120553 is 355021891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179345664 + 18774889 = 13392^2 + 4333^2 .

It is a cyclic number.

It is not a de Polignac number, because 198120553 - 2⁵ = 198120521 is a prime.

It is not a weakly prime, because it can be changed into another prime (198120653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99060276 + 99060277.

It is an arithmetic number, because the mean of its divisors is an integer number (99060277).

Almost surely, 2^198120553 is an apocalyptic number.

It is an amenable number.

198120553 is a deficient number, since it is larger than the sum of its proper divisors (1).

198120553 is an equidigital number, since it uses as much as digits as its factorization.

198120553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 198120553 is about 14075.5302919641. The cubic root of 198120553 is about 582.9659339474.

The spelling of 198120553 in words is "one hundred ninety-eight million, one hundred twenty thousand, five hundred fifty-three".