2281521 has 16 divisors (see below), whose sum is σ = 3391488. Its totient is φ = 1352400.

The previous prime is 2281493. The next prime is 2281529. The reversal of 2281521 is 1251822.

It is a happy number.

It is not a de Polignac number, because 2281521 - 2¹⁰ = 2280497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2281529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 816 + ... + 2286.

It is an arithmetic number, because the mean of its divisors is an integer number (211968).

2^2281521 is an apocalyptic number.

It is an amenable number.

2281521 is a deficient number, since it is larger than the sum of its proper divisors (1109967).

2281521 is a wasteful number, since it uses less digits than its factorization.

2281521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532.

The product of its digits is 320, while the sum is 21.

The square root of 2281521 is about 1510.4704565135. The cubic root of 2281521 is about 131.6461482385.

The spelling of 2281521 in words is "two million, two hundred eighty-one thousand, five hundred twenty-one".