4224207781 has 2 divisors, whose sum is σ = 4224207782. Its totient is φ = 4224207780.

The previous prime is 4224207733. The next prime is 4224207803. The reversal of 4224207781 is 1877024224.

4224207781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3045384225 + 1178823556 = 55185^2 + 34334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4224207781 is a prime.

It is a super-2 number, since 2×4224207781² = 35687862754121887922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 4224207781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4224207731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2112103890 + 2112103891.

It is an arithmetic number, because the mean of its divisors is an integer number (2112103891).

Almost surely, 2^4224207781 is an apocalyptic number.

It is an amenable number.

4224207781 is a deficient number, since it is larger than the sum of its proper divisors (1).

4224207781 is an equidigital number, since it uses as much as digits as its factorization.

4224207781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50176, while the sum is 37.

The square root of 4224207781 is about 64993.9057219983. The cubic root of 4224207781 is about 1616.5225132718.

The spelling of 4224207781 in words is "four billion, two hundred twenty-four million, two hundred seven thousand, seven hundred eighty-one".