198725641 has 2 divisors, whose sum is σ = 198725642. Its totient is φ = 198725640.

The previous prime is 198725627. The next prime is 198725671. The reversal of 198725641 is 146527891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156150016 + 42575625 = 12496^2 + 6525^2 .

It is a cyclic number.

It is not a de Polignac number, because 198725641 - 2¹⁷ = 198594569 is a prime.

It is not a weakly prime, because it can be changed into another prime (198725671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99362820 + 99362821.

It is an arithmetic number, because the mean of its divisors is an integer number (99362821).

Almost surely, 2^198725641 is an apocalyptic number.

It is an amenable number.

198725641 is a deficient number, since it is larger than the sum of its proper divisors (1).

198725641 is an equidigital number, since it uses as much as digits as its factorization.

198725641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 198725641 is about 14097.0082286987. The cubic root of 198725641 is about 583.5588173916.

The spelling of 198725641 in words is "one hundred ninety-eight million, seven hundred twenty-five thousand, six hundred forty-one".