198409361 has 2 divisors, whose sum is σ = 198409362. Its totient is φ = 198409360.

The previous prime is 198409357. The next prime is 198409403. The reversal of 198409361 is 163904891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153264400 + 45144961 = 12380^2 + 6719^2 .

It is a cyclic number.

It is not a de Polignac number, because 198409361 - 2² = 198409357 is a prime.

It is not a weakly prime, because it can be changed into another prime (198409961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99204680 + 99204681.

It is an arithmetic number, because the mean of its divisors is an integer number (99204681).

Almost surely, 2^198409361 is an apocalyptic number.

It is an amenable number.

198409361 is a deficient number, since it is larger than the sum of its proper divisors (1).

198409361 is an equidigital number, since it uses as much as digits as its factorization.

198409361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 198409361 is about 14085.7857785783. The cubic root of 198409361 is about 583.2490670840.

The spelling of 198409361 in words is "one hundred ninety-eight million, four hundred nine thousand, three hundred sixty-one".