256371671 has 2 divisors, whose sum is σ = 256371672. Its totient is φ = 256371670.

The previous prime is 256371667. The next prime is 256371701. The reversal of 256371671 is 176173652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256371671 - 2² = 256371667 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 (256371601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128185835 + 128185836.

It is an arithmetic number, because the mean of its divisors is an integer number (128185836).

Almost surely, 2^256371671 is an apocalyptic number.

256371671 is a deficient number, since it is larger than the sum of its proper divisors (1).

256371671 is an equidigital number, since it uses as much as digits as its factorization.

256371671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 38.

The square root of 256371671 is about 16011.6105061296. The cubic root of 256371671 is about 635.2675591427.

The spelling of 256371671 in words is "two hundred fifty-six million, three hundred seventy-one thousand, six hundred seventy-one".