1256688487 has 2 divisors, whose sum is σ = 1256688488. Its totient is φ = 1256688486.

The previous prime is 1256688473. The next prime is 1256688497. The reversal of 1256688487 is 7848866521.

It is a strong prime.

It is an emirp because it is prime and its reverse (7848866521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1256688487 - 2¹⁹ = 1256164199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256688457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628344243 + 628344244.

It is an arithmetic number, because the mean of its divisors is an integer number (628344244).

Almost surely, 2^1256688487 is an apocalyptic number.

1256688487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256688487 is an equidigital number, since it uses as much as digits as its factorization.

1256688487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5160960, while the sum is 55.

The square root of 1256688487 is about 35449.8023548792. The cubic root of 1256688487 is about 1079.1352494272.

The spelling of 1256688487 in words is "one billion, two hundred fifty-six million, six hundred eighty-eight thousand, four hundred eighty-seven".