4243247681 has 4 divisors (see below), whose sum is σ = 4323309012. Its totient is φ = 4163186352.

The previous prime is 4243247641. The next prime is 4243247683. The reversal of 4243247681 is 1867423424.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3435835456 + 807412225 = 58616^2 + 28415^2 .

It is a cyclic number.

It is not a de Polignac number, because 4243247681 - 2²⁶ = 4176138817 is a prime.

It is a super-2 number, since 2×4243247681² = 36010301764623755522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4243247683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40030586 + ... + 40030691.

It is an arithmetic number, because the mean of its divisors is an integer number (1080827253).

Almost surely, 2^4243247681 is an apocalyptic number.

It is an amenable number.

4243247681 is a deficient number, since it is larger than the sum of its proper divisors (80061331).

4243247681 is an equidigital number, since it uses as much as digits as its factorization.

4243247681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80061330.

The product of its digits is 258048, while the sum is 41.

The square root of 4243247681 is about 65140.2155430883. The cubic root of 4243247681 is about 1618.9476070168.

The spelling of 4243247681 in words is "four billion, two hundred forty-three million, two hundred forty-seven thousand, six hundred eighty-one".