198465121 has 2 divisors, whose sum is σ = 198465122. Its totient is φ = 198465120.

The previous prime is 198465119. The next prime is 198465139. The reversal of 198465121 is 121564891.

198465121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161010721 + 37454400 = 12689^2 + 6120^2 .

It is a cyclic number.

It is not a de Polignac number, because 198465121 - 2¹ = 198465119 is a prime.

Together with 198465119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (198465221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99232560 + 99232561.

It is an arithmetic number, because the mean of its divisors is an integer number (99232561).

Almost surely, 2^198465121 is an apocalyptic number.

It is an amenable number.

198465121 is a deficient number, since it is larger than the sum of its proper divisors (1).

198465121 is an equidigital number, since it uses as much as digits as its factorization.

198465121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 37.

The square root of 198465121 is about 14087.7649398334. The cubic root of 198465121 is about 583.3036997917.

The spelling of 198465121 in words is "one hundred ninety-eight million, four hundred sixty-five thousand, one hundred twenty-one".