257889971 has 2 divisors, whose sum is σ = 257889972. Its totient is φ = 257889970.

The previous prime is 257889941. The next prime is 257890001. The reversal of 257889971 is 179988752.

It is a balanced prime because it is at equal distance from previous prime (257889941) and next prime (257890001).

It is a cyclic number.

It is not a de Polignac number, because 257889971 - 2¹⁰ = 257888947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (257889941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128944985 + 128944986.

It is an arithmetic number, because the mean of its divisors is an integer number (128944986).

Almost surely, 2^257889971 is an apocalyptic number.

257889971 is a deficient number, since it is larger than the sum of its proper divisors (1).

257889971 is an equidigital number, since it uses as much as digits as its factorization.

257889971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 56.

The square root of 257889971 is about 16058.9529857958. The cubic root of 257889971 is about 636.5191650781.

The spelling of 257889971 in words is "two hundred fifty-seven million, eight hundred eighty-nine thousand, nine hundred seventy-one".