198725771 has 2 divisors, whose sum is σ = 198725772. Its totient is φ = 198725770.

The previous prime is 198725753. The next prime is 198725797. The reversal of 198725771 is 177527891.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198725771 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198725171) 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, 99362885 + 99362886.

It is an arithmetic number, because the mean of its divisors is an integer number (99362886).

Almost surely, 2^198725771 is an apocalyptic number.

198725771 is a deficient number, since it is larger than the sum of its proper divisors (1).

198725771 is an equidigital number, since it uses as much as digits as its factorization.

198725771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 246960, while the sum is 47.

The square root of 198725771 is about 14097.0128396054. The cubic root of 198725771 is about 583.5589446401.

The spelling of 198725771 in words is "one hundred ninety-eight million, seven hundred twenty-five thousand, seven hundred seventy-one".