198756461 has 2 divisors, whose sum is σ = 198756462. Its totient is φ = 198756460.

The previous prime is 198756457. The next prime is 198756499. The reversal of 198756461 is 164657891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163353961 + 35402500 = 12781^2 + 5950^2 .

It is an emirp because it is prime and its reverse (164657891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198756461 - 2² = 198756457 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198756451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99378230 + 99378231.

It is an arithmetic number, because the mean of its divisors is an integer number (99378231).

Almost surely, 2^198756461 is an apocalyptic number.

It is an amenable number.

198756461 is a deficient number, since it is larger than the sum of its proper divisors (1).

198756461 is an equidigital number, since it uses as much as digits as its factorization.

198756461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 47.

The square root of 198756461 is about 14098.1013260652. The cubic root of 198756461 is about 583.5889835258.

The spelling of 198756461 in words is "one hundred ninety-eight million, seven hundred fifty-six thousand, four hundred sixty-one".