257206487 has 2 divisors, whose sum is σ = 257206488. Its totient is φ = 257206486.

The previous prime is 257206483. The next prime is 257206519. The reversal of 257206487 is 784602752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257206487 - 2² = 257206483 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257206483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128603243 + 128603244.

It is an arithmetic number, because the mean of its divisors is an integer number (128603244).

Almost surely, 2^257206487 is an apocalyptic number.

257206487 is a deficient number, since it is larger than the sum of its proper divisors (1).

257206487 is an equidigital number, since it uses as much as digits as its factorization.

257206487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 188160, while the sum is 41.

The square root of 257206487 is about 16037.6584014001. The cubic root of 257206487 is about 635.9563467988.

The spelling of 257206487 in words is "two hundred fifty-seven million, two hundred six thousand, four hundred eighty-seven".