256356213 has 4 divisors (see below), whose sum is σ = 341808288. Its totient is φ = 170904140.

The previous prime is 256356211. The next prime is 256356253. The reversal of 256356213 is 312653652.

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 256356213 - 2¹ = 256356211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256356211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42726033 + ... + 42726038.

It is an arithmetic number, because the mean of its divisors is an integer number (85452072).

Almost surely, 2^256356213 is an apocalyptic number.

It is an amenable number.

256356213 is a deficient number, since it is larger than the sum of its proper divisors (85452075).

256356213 is an equidigital number, since it uses as much as digits as its factorization.

256356213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85452074.

The product of its digits is 32400, while the sum is 33.

The square root of 256356213 is about 16011.1277866364. The cubic root of 256356213 is about 635.2547910090.

The spelling of 256356213 in words is "two hundred fifty-six million, three hundred fifty-six thousand, two hundred thirteen".