8281521 has 10 divisors (see below), whose sum is σ = 12371282. Its totient is φ = 5520960.

The previous prime is 8281517. The next prime is 8281531. The reversal of 8281521 is 1251828.

It can be written as a sum of positive squares in only one way, i.e., 7535025 + 746496 = 2745^2 + 864^2 .

It is not a de Polignac number, because 8281521 - 2² = 8281517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8281531) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 51040 + ... + 51201.

Almost surely, 2^8281521 is an apocalyptic number.

8281521 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

8281521 is a deficient number, since it is larger than the sum of its proper divisors (4089761).

8281521 is a wasteful number, since it uses less digits than its factorization.

8281521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102253 (or 102244 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 8281521 is about 2877.7631938712. The cubic root of 8281521 is about 202.3190152475.

The spelling of 8281521 in words is "eight million, two hundred eighty-one thousand, five hundred twenty-one".