256169671 has 2 divisors, whose sum is σ = 256169672. Its totient is φ = 256169670.

The previous prime is 256169621. The next prime is 256169677. The reversal of 256169671 is 176961652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256169671 - 2⁹ = 256169159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256169677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128084835 + 128084836.

It is an arithmetic number, because the mean of its divisors is an integer number (128084836).

Almost surely, 2^256169671 is an apocalyptic number.

256169671 is a deficient number, since it is larger than the sum of its proper divisors (1).

256169671 is an equidigital number, since it uses as much as digits as its factorization.

256169671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 256169671 is about 16005.3013404934. The cubic root of 256169671 is about 635.1006689344.

The spelling of 256169671 in words is "two hundred fifty-six million, one hundred sixty-nine thousand, six hundred seventy-one".