198271903 has 2 divisors, whose sum is σ = 198271904. Its totient is φ = 198271902.

The previous prime is 198271873. The next prime is 198271921. The reversal of 198271903 is 309172891.

It is a strong prime.

It is an emirp because it is prime and its reverse (309172891) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198271903 is a prime.

It is equal to p_10988446 and since 198271903 and 10988446 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198271933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99135951 + 99135952.

It is an arithmetic number, because the mean of its divisors is an integer number (99135952).

Almost surely, 2^198271903 is an apocalyptic number.

198271903 is a deficient number, since it is larger than the sum of its proper divisors (1).

198271903 is an equidigital number, since it uses as much as digits as its factorization.

198271903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 198271903 is about 14080.9056171824. The cubic root of 198271903 is about 583.1143443212.

The spelling of 198271903 in words is "one hundred ninety-eight million, two hundred seventy-one thousand, nine hundred three".