257489207 has 2 divisors, whose sum is σ = 257489208. Its totient is φ = 257489206.

The previous prime is 257489161. The next prime is 257489227. The reversal of 257489207 is 702984752.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257489207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257489227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128744603 + 128744604.

It is an arithmetic number, because the mean of its divisors is an integer number (128744604).

Almost surely, 2^257489207 is an apocalyptic number.

257489207 is a deficient number, since it is larger than the sum of its proper divisors (1).

257489207 is an equidigital number, since it uses as much as digits as its factorization.

257489207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 44.

The square root of 257489207 is about 16046.4702349146. The cubic root of 257489207 is about 636.1892747512.

The spelling of 257489207 in words is "two hundred fifty-seven million, four hundred eighty-nine thousand, two hundred seven".