8722772581 has 2 divisors, whose sum is σ = 8722772582. Its totient is φ = 8722772580.

The previous prime is 8722772551. The next prime is 8722772593. The reversal of 8722772581 is 1852772278.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8673196900 + 49575681 = 93130^2 + 7041^2 .

It is a cyclic number.

It is not a de Polignac number, because 8722772581 - 2²³ = 8714383973 is a prime.

It is a super-2 number, since 2×8722772581² (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 (8722772551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4361386290 + 4361386291.

It is an arithmetic number, because the mean of its divisors is an integer number (4361386291).

Almost surely, 2^8722772581 is an apocalyptic number.

It is an amenable number.

8722772581 is a deficient number, since it is larger than the sum of its proper divisors (1).

8722772581 is an equidigital number, since it uses as much as digits as its factorization.

8722772581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 878080, while the sum is 49.

The square root of 8722772581 is about 93395.7845997345. The cubic root of 8722772581 is about 2058.5030584095.

The spelling of 8722772581 in words is "eight billion, seven hundred twenty-two million, seven hundred seventy-two thousand, five hundred eighty-one".