1256911 has 2 divisors, whose sum is σ = 1256912. Its totient is φ = 1256910.

The previous prime is 1256903. The next prime is 1256917. The reversal of 1256911 is 1196521.

It is a strong prime.

It is an emirp because it is prime and its reverse (1196521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1256911 - 2³ = 1256903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628455 + 628456.

It is an arithmetic number, because the mean of its divisors is an integer number (628456).

2^1256911 is an apocalyptic number.

1256911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256911 is an equidigital number, since it uses as much as digits as its factorization.

1256911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 25.

The square root of 1256911 is about 1121.1204217211. The cubic root of 1256911 is about 107.9198937300.

The spelling of 1256911 in words is "one million, two hundred fifty-six thousand, nine hundred eleven".