256213226 has 16 divisors (see below), whose sum is σ = 390627360. Its totient is φ = 126009840.

The previous prime is 256213219. The next prime is 256213247. The reversal of 256213226 is 622312652.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157445 + ... + 159063.

It is an arithmetic number, because the mean of its divisors is an integer number (24414210).

Almost surely, 2^256213226 is an apocalyptic number.

256213226 is a deficient number, since it is larger than the sum of its proper divisors (134414134).

256213226 is a wasteful number, since it uses less digits than its factorization.

256213226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2869.

The product of its digits is 8640, while the sum is 29.

The square root of 256213226 is about 16006.6619255859. The cubic root of 256213226 is about 635.1366610199.

Adding to 256213226 its reverse (622312652), we get a palindrome (878525878).

The spelling of 256213226 in words is "two hundred fifty-six million, two hundred thirteen thousand, two hundred twenty-six".