2256521 has 8 divisors (see below), whose sum is σ = 2360064. Its totient is φ = 2154960.

The previous prime is 2256479. The next prime is 2256533. The reversal of 2256521 is 1256522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2256521 - 2¹⁴ = 2240137 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2256571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2135 + ... + 3011.

It is an arithmetic number, because the mean of its divisors is an integer number (295008).

2^2256521 is an apocalyptic number.

It is an amenable number.

2256521 is a deficient number, since it is larger than the sum of its proper divisors (103543).

2256521 is an equidigital number, since it uses as much as digits as its factorization.

2256521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991.

The product of its digits is 1200, while the sum is 23.

The square root of 2256521 is about 1502.1720940025. The cubic root of 2256521 is about 131.1635391260.

Subtracting from 2256521 its reverse (1256522), we obtain a palindrome (999999).

The spelling of 2256521 in words is "two million, two hundred fifty-six thousand, five hundred twenty-one".