9215281 has 4 divisors (see below), whose sum is σ = 9221364. Its totient is φ = 9209200.

The previous prime is 9215251. The next prime is 9215293. The reversal of 9215281 is 1825129.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6170256 + 3045025 = 2484^2 + 1745^2 .

It is a cyclic number.

It is not a de Polignac number, because 9215281 - 2⁹ = 9214769 is a prime.

It is a super-2 number, since 2×9215281² = 169842807817922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9215231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1251 + ... + 4471.

It is an arithmetic number, because the mean of its divisors is an integer number (2305341).

Almost surely, 2^9215281 is an apocalyptic number.

It is an amenable number.

9215281 is a deficient number, since it is larger than the sum of its proper divisors (6083).

9215281 is a wasteful number, since it uses less digits than its factorization.

9215281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6082.

The product of its digits is 1440, while the sum is 28.

The square root of 9215281 is about 3035.6681307416. The cubic root of 9215281 is about 209.6538591002.

The spelling of 9215281 in words is "nine million, two hundred fifteen thousand, two hundred eighty-one".