2256116521 has 4 divisors (see below), whose sum is σ = 2256446592. Its totient is φ = 2255786452.

The previous prime is 2256116503. The next prime is 2256116573. The reversal of 2256116521 is 1256116522.

2256116521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2256116521 - 2¹⁹ = 2255592233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2256116581) 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, 154561 + ... + 168526.

It is an arithmetic number, because the mean of its divisors is an integer number (564111648).

Almost surely, 2^2256116521 is an apocalyptic number.

It is an amenable number.

2256116521 is a deficient number, since it is larger than the sum of its proper divisors (330071).

2256116521 is an equidigital number, since it uses as much as digits as its factorization.

2256116521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330070.

The product of its digits is 7200, while the sum is 31.

The square root of 2256116521 is about 47498.5949371137. The cubic root of 2256116521 is about 1311.5570168251.

Subtracting from 2256116521 its reverse (1256116522), we obtain a palindrome (999999999).

The spelling of 2256116521 in words is "two billion, two hundred fifty-six million, one hundred sixteen thousand, five hundred twenty-one".