198445957 has 2 divisors, whose sum is σ = 198445958. Its totient is φ = 198445956.

The previous prime is 198445943. The next prime is 198445963. The reversal of 198445957 is 759544891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198274561 + 171396 = 14081^2 + 414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198445957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198446957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99222978 + 99222979.

It is an arithmetic number, because the mean of its divisors is an integer number (99222979).

Almost surely, 2^198445957 is an apocalyptic number.

It is an amenable number.

198445957 is a deficient number, since it is larger than the sum of its proper divisors (1).

198445957 is an equidigital number, since it uses as much as digits as its factorization.

198445957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 52.

The square root of 198445957 is about 14087.0847587427. The cubic root of 198445957 is about 583.2849243819.

The spelling of 198445957 in words is "one hundred ninety-eight million, four hundred forty-five thousand, nine hundred fifty-seven".