257545279 has 2 divisors, whose sum is σ = 257545280. Its totient is φ = 257545278.

The previous prime is 257545261. The next prime is 257545307. The reversal of 257545279 is 972545752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257545279 - 2⁷ = 257545151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257545219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128772639 + 128772640.

It is an arithmetic number, because the mean of its divisors is an integer number (128772640).

Almost surely, 2^257545279 is an apocalyptic number.

257545279 is a deficient number, since it is larger than the sum of its proper divisors (1).

257545279 is an equidigital number, since it uses as much as digits as its factorization.

257545279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 882000, while the sum is 46.

The square root of 257545279 is about 16048.2173153282. The cubic root of 257545279 is about 636.2354512056.

The spelling of 257545279 in words is "two hundred fifty-seven million, five hundred forty-five thousand, two hundred seventy-nine".