4772221981 has 2 divisors, whose sum is σ = 4772221982. Its totient is φ = 4772221980.

The previous prime is 4772221943. The next prime is 4772222009. The reversal of 4772221981 is 1891222774.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3453442756 + 1318779225 = 58766^2 + 36315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4772221981 is a prime.

It is a super-2 number, since 2×4772221981² = 45548205271879128722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4772221921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2386110990 + 2386110991.

It is an arithmetic number, because the mean of its divisors is an integer number (2386110991).

Almost surely, 2^4772221981 is an apocalyptic number.

It is an amenable number.

4772221981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4772221981 is an equidigital number, since it uses as much as digits as its factorization.

4772221981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 43.

The square root of 4772221981 is about 69081.2708409450. The cubic root of 4772221981 is about 1683.6050209539.

The spelling of 4772221981 in words is "four billion, seven hundred seventy-two million, two hundred twenty-one thousand, nine hundred eighty-one".