8221774381 has 2 divisors, whose sum is σ = 8221774382. Its totient is φ = 8221774380.

The previous prime is 8221774229. The next prime is 8221774433. The reversal of 8221774381 is 1834771228.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6418413225 + 1803361156 = 80115^2 + 42466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8221774381 is a prime.

It is a super-2 number, since 2×8221774381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8221774681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4110887190 + 4110887191.

It is an arithmetic number, because the mean of its divisors is an integer number (4110887191).

Almost surely, 2^8221774381 is an apocalyptic number.

It is an amenable number.

8221774381 is a deficient number, since it is larger than the sum of its proper divisors (1).

8221774381 is an equidigital number, since it uses as much as digits as its factorization.

8221774381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 43.

The square root of 8221774381 is about 90674.0005789973. Note that the first 3 decimals coincide. The cubic root of 8221774381 is about 2018.3130035701.

The spelling of 8221774381 in words is "eight billion, two hundred twenty-one million, seven hundred seventy-four thousand, three hundred eighty-one".