257671 has 2 divisors, whose sum is σ = 257672. Its totient is φ = 257670.

The previous prime is 257657. The next prime is 257687. The reversal of 257671 is 176752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257671 - 2⁵ = 257639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128835 + 128836.

It is an arithmetic number, because the mean of its divisors is an integer number (128836).

2²⁵⁷⁶⁷¹ is an apocalyptic number.

257671 is a deficient number, since it is larger than the sum of its proper divisors (1).

257671 is an equidigital number, since it uses as much as digits as its factorization.

257671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2940, while the sum is 28.

The square root of 257671 is about 507.6130415976. The cubic root of 257671 is about 63.6338960701.

The spelling of 257671 in words is "two hundred fifty-seven thousand, six hundred seventy-one".