198795761 has 2 divisors, whose sum is σ = 198795762. Its totient is φ = 198795760.

The previous prime is 198795749. The next prime is 198795763. The reversal of 198795761 is 167597891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198669025 + 126736 = 14095^2 + 356^2 .

It is an emirp because it is prime and its reverse (167597891) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198795761 is a prime.

Together with 198795763, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198795763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99397880 + 99397881.

It is an arithmetic number, because the mean of its divisors is an integer number (99397881).

Almost surely, 2^198795761 is an apocalyptic number.

It is an amenable number.

198795761 is a deficient number, since it is larger than the sum of its proper divisors (1).

198795761 is an equidigital number, since it uses as much as digits as its factorization.

198795761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 53.

The square root of 198795761 is about 14099.4950618808. The cubic root of 198795761 is about 583.6274452282.

The spelling of 198795761 in words is "one hundred ninety-eight million, seven hundred ninety-five thousand, seven hundred sixty-one".