243464681 has 2 divisors, whose sum is σ = 243464682. Its totient is φ = 243464680.

The previous prime is 243464677. The next prime is 243464713. The reversal of 243464681 is 186464342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232837081 + 10627600 = 15259^2 + 3260^2 .

It is a cyclic number.

It is not a de Polignac number, because 243464681 - 2² = 243464677 is a prime.

It is a super-2 number, since 2×243464681² = 118550101788863522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (243464381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121732340 + 121732341.

It is an arithmetic number, because the mean of its divisors is an integer number (121732341).

Almost surely, 2^243464681 is an apocalyptic number.

It is an amenable number.

243464681 is a deficient number, since it is larger than the sum of its proper divisors (1).

243464681 is an equidigital number, since it uses as much as digits as its factorization.

243464681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 38.

The square root of 243464681 is about 15603.3547995295. The cubic root of 243464681 is about 624.4226613056.

The spelling of 243464681 in words is "two hundred forty-three million, four hundred sixty-four thousand, six hundred eighty-one".