256223347 has 2 divisors, whose sum is σ = 256223348. Its totient is φ = 256223346.

The previous prime is 256223333. The next prime is 256223393. The reversal of 256223347 is 743322652.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256223347 is a prime.

It is not a weakly prime, because it can be changed into another prime (256223447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128111673 + 128111674.

It is an arithmetic number, because the mean of its divisors is an integer number (128111674).

Almost surely, 2^256223347 is an apocalyptic number.

256223347 is a deficient number, since it is larger than the sum of its proper divisors (1).

256223347 is an equidigital number, since it uses as much as digits as its factorization.

256223347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 34.

The square root of 256223347 is about 16006.9780720784. The cubic root of 256223347 is about 635.1450240197.

Adding to 256223347 its reverse (743322652), we get a palindrome (999545999).

The spelling of 256223347 in words is "two hundred fifty-six million, two hundred twenty-three thousand, three hundred forty-seven".