198904481 has 2 divisors, whose sum is σ = 198904482. Its totient is φ = 198904480.

The previous prime is 198904429. The next prime is 198904513. The reversal of 198904481 is 184409891.

198904481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167443600 + 31460881 = 12940^2 + 5609^2 .

It is an emirp because it is prime and its reverse (184409891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198904481 - 2¹⁴ = 198888097 is a prime.

It is a super-2 number, since 2×198904481² = 79125985123758722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (198904081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99452240 + 99452241.

It is an arithmetic number, because the mean of its divisors is an integer number (99452241).

Almost surely, 2^198904481 is an apocalyptic number.

It is an amenable number.

198904481 is a deficient number, since it is larger than the sum of its proper divisors (1).

198904481 is an equidigital number, since it uses as much as digits as its factorization.

198904481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 198904481 is about 14103.3499921118. The cubic root of 198904481 is about 583.7338197503.

The spelling of 198904481 in words is "one hundred ninety-eight million, nine hundred four thousand, four hundred eighty-one".