1256659 has 2 divisors, whose sum is σ = 1256660. Its totient is φ = 1256658.

The previous prime is 1256621. The next prime is 1256681. The reversal of 1256659 is 9566521.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1256659 - 2⁷ = 1256531 is a prime.

It is equal to p₉₆₉₂₈ and since 1256659 and 96928 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1259659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628329 + 628330.

It is an arithmetic number, because the mean of its divisors is an integer number (628330).

2^1256659 is an apocalyptic number.

1256659 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256659 is an equidigital number, since it uses as much as digits as its factorization.

1256659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 34.

The square root of 1256659 is about 1121.0080285172. The cubic root of 1256659 is about 107.9126809067.

The spelling of 1256659 in words is "one million, two hundred fifty-six thousand, six hundred fifty-nine".