198440761 has 2 divisors, whose sum is σ = 198440762. Its totient is φ = 198440760.

The previous prime is 198440729. The next prime is 198440771. The reversal of 198440761 is 167044891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120012025 + 78428736 = 10955^2 + 8856^2 .

It is a cyclic number.

It is not a de Polignac number, because 198440761 - 2⁵ = 198440729 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198440701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99220380 + 99220381.

It is an arithmetic number, because the mean of its divisors is an integer number (99220381).

Almost surely, 2^198440761 is an apocalyptic number.

It is an amenable number.

198440761 is a deficient number, since it is larger than the sum of its proper divisors (1).

198440761 is an equidigital number, since it uses as much as digits as its factorization.

198440761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 198440761 is about 14086.9003332884. The cubic root of 198440761 is about 583.2798335334.

The spelling of 198440761 in words is "one hundred ninety-eight million, four hundred forty thousand, seven hundred sixty-one".