198924161 has 2 divisors, whose sum is σ = 198924162. Its totient is φ = 198924160.

The previous prime is 198924127. The next prime is 198924199. The reversal of 198924161 is 161429891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183439936 + 15484225 = 13544^2 + 3935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198924161 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (198924101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99462080 + 99462081.

It is an arithmetic number, because the mean of its divisors is an integer number (99462081).

Almost surely, 2^198924161 is an apocalyptic number.

It is an amenable number.

198924161 is a deficient number, since it is larger than the sum of its proper divisors (1).

198924161 is an equidigital number, since it uses as much as digits as its factorization.

198924161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 41.

The square root of 198924161 is about 14104.0476814282. The cubic root of 198924161 is about 583.7530710389.

The spelling of 198924161 in words is "one hundred ninety-eight million, nine hundred twenty-four thousand, one hundred sixty-one".