256860671 has 2 divisors, whose sum is σ = 256860672. Its totient is φ = 256860670.

The previous prime is 256860649. The next prime is 256860719. The reversal of 256860671 is 176068652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256860671 - 2²² = 252666367 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256860641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128430335 + 128430336.

It is an arithmetic number, because the mean of its divisors is an integer number (128430336).

Almost surely, 2^256860671 is an apocalyptic number.

256860671 is a deficient number, since it is larger than the sum of its proper divisors (1).

256860671 is an equidigital number, since it uses as much as digits as its factorization.

256860671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 256860671 is about 16026.8734006356. The cubic root of 256860671 is about 635.6712029839.

The spelling of 256860671 in words is "two hundred fifty-six million, eight hundred sixty thousand, six hundred seventy-one".