199968481 has 2 divisors, whose sum is σ = 199968482. Its totient is φ = 199968480.

The previous prime is 199968479. The next prime is 199968539. The reversal of 199968481 is 184869991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149842081 + 50126400 = 12241^2 + 7080^2 .

It is an emirp because it is prime and its reverse (184869991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199968481 - 2¹ = 199968479 is a prime.

It is a super-2 number, since 2×199968481² = 79974786786894722, which contains 22 as substring.

Together with 199968479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (199968581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99984240 + 99984241.

It is an arithmetic number, because the mean of its divisors is an integer number (99984241).

Almost surely, 2^199968481 is an apocalyptic number.

It is an amenable number.

199968481 is a deficient number, since it is larger than the sum of its proper divisors (1).

199968481 is an equidigital number, since it uses as much as digits as its factorization.

199968481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 55.

The square root of 199968481 is about 14141.0212148911. The cubic root of 199968481 is about 584.7728253236.

The spelling of 199968481 in words is "one hundred ninety-nine million, nine hundred sixty-eight thousand, four hundred eighty-one".