256944671 has 2 divisors, whose sum is σ = 256944672. Its totient is φ = 256944670.

The previous prime is 256944659. The next prime is 256944673. The reversal of 256944671 is 176449652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256944671 - 2⁶ = 256944607 is a prime.

Together with 256944673, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256944673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128472335 + 128472336.

It is an arithmetic number, because the mean of its divisors is an integer number (128472336).

Almost surely, 2^256944671 is an apocalyptic number.

256944671 is a deficient number, since it is larger than the sum of its proper divisors (1).

256944671 is an equidigital number, since it uses as much as digits as its factorization.

256944671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 44.

The square root of 256944671 is about 16029.4937848954. The cubic root of 256944671 is about 635.7404890047.

The spelling of 256944671 in words is "two hundred fifty-six million, nine hundred forty-four thousand, six hundred seventy-one".