243961481 has 2 divisors, whose sum is σ = 243961482. Its totient is φ = 243961480.

The previous prime is 243961447. The next prime is 243961567. The reversal of 243961481 is 184169342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231648400 + 12313081 = 15220^2 + 3509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243961481 is a prime.

It is a super-2 number, since 2×243961481² = 119034408423426722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243961181) 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, 121980740 + 121980741.

It is an arithmetic number, because the mean of its divisors is an integer number (121980741).

Almost surely, 2^243961481 is an apocalyptic number.

It is an amenable number.

243961481 is a deficient number, since it is larger than the sum of its proper divisors (1).

243961481 is an equidigital number, since it uses as much as digits as its factorization.

243961481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 38.

The square root of 243961481 is about 15619.2663400046. The cubic root of 243961481 is about 624.8470930475.

It can be divided in two parts, 243961 and 481, that added together give a palindrome (244442).

The spelling of 243961481 in words is "two hundred forty-three million, nine hundred sixty-one thousand, four hundred eighty-one".