198725437 has 2 divisors, whose sum is σ = 198725438. Its totient is φ = 198725436.

The previous prime is 198725413. The next prime is 198725453. The reversal of 198725437 is 734527891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195832036 + 2893401 = 13994^2 + 1701^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198725437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198725477) 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, 99362718 + 99362719.

It is an arithmetic number, because the mean of its divisors is an integer number (99362719).

Almost surely, 2^198725437 is an apocalyptic number.

It is an amenable number.

198725437 is a deficient number, since it is larger than the sum of its proper divisors (1).

198725437 is an equidigital number, since it uses as much as digits as its factorization.

198725437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 46.

The square root of 198725437 is about 14097.0009931191. Note that the first 3 decimals coincide. The cubic root of 198725437 is about 583.5586177092.

The spelling of 198725437 in words is "one hundred ninety-eight million, seven hundred twenty-five thousand, four hundred thirty-seven".