8821505281 has 4 divisors (see below), whose sum is σ = 8822810692. Its totient is φ = 8820199872.

The previous prime is 8821505267. The next prime is 8821505321. The reversal of 8821505281 is 1825051288.

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 5562922225 + 3258583056 = 74585^2 + 57084^2 .

It is a cyclic number.

It is not a de Polignac number, because 8821505281 - 2¹⁷ = 8821374209 is a prime.

It is a super-2 number, since 2×8821505281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8821565281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642516 + ... + 656101.

It is an arithmetic number, because the mean of its divisors is an integer number (2205702673).

Almost surely, 2^8821505281 is an apocalyptic number.

It is an amenable number.

8821505281 is a deficient number, since it is larger than the sum of its proper divisors (1305411).

8821505281 is a wasteful number, since it uses less digits than its factorization.

8821505281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305410.

The product of its (nonzero) digits is 51200, while the sum is 40.

The square root of 8821505281 is about 93922.8687860417. The cubic root of 8821505281 is about 2066.2406411330.

The spelling of 8821505281 in words is "eight billion, eight hundred twenty-one million, five hundred five thousand, two hundred eighty-one".