256449221 has 4 divisors (see below), whose sum is σ = 293084832. Its totient is φ = 219813612.

The previous prime is 256449211. The next prime is 256449239. The reversal of 256449221 is 122944652.

256449221 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 256449221 - 2²² = 252254917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256449211) 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, 18317795 + ... + 18317808.

It is an arithmetic number, because the mean of its divisors is an integer number (73271208).

Almost surely, 2^256449221 is an apocalyptic number.

It is an amenable number.

256449221 is a deficient number, since it is larger than the sum of its proper divisors (36635611).

256449221 is an equidigital number, since it uses as much as digits as its factorization.

256449221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36635610.

The product of its digits is 34560, while the sum is 35.

The square root of 256449221 is about 16014.0320032152. The cubic root of 256449221 is about 635.3316068232.

The spelling of 256449221 in words is "two hundred fifty-six million, four hundred forty-nine thousand, two hundred twenty-one".