1256711 has 2 divisors, whose sum is σ = 1256712. Its totient is φ = 1256710.

The previous prime is 1256707. The next prime is 1256729. The reversal of 1256711 is 1176521.

It is a weak prime.

It is an emirp because it is prime and its reverse (1176521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1256711 - 2² = 1256707 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 (1256611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628355 + 628356.

It is an arithmetic number, because the mean of its divisors is an integer number (628356).

2^1256711 is an apocalyptic number.

1256711 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256711 is an equidigital number, since it uses as much as digits as its factorization.

1256711 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 23.

The square root of 1256711 is about 1121.0312216883. The cubic root of 1256711 is about 107.9141693460.

The spelling of 1256711 in words is "one million, two hundred fifty-six thousand, seven hundred eleven".