1256563 has 8 divisors (see below), whose sum is σ = 1566720. Its totient is φ = 979080.

The previous prime is 1256543. The next prime is 1256573. The reversal of 1256563 is 3656521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1256563 - 2⁵ = 1256531 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256533) by changing a digit.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8083 + ... + 8236.

It is an arithmetic number, because the mean of its divisors is an integer number (195840).

2^1256563 is an apocalyptic number.

1256563 is a deficient number, since it is larger than the sum of its proper divisors (310157).

1256563 is a wasteful number, since it uses less digits than its factorization.

1256563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16337.

The product of its digits is 5400, while the sum is 28.

The square root of 1256563 is about 1120.9652090944. The cubic root of 1256563 is about 107.9099329109.

The spelling of 1256563 in words is "one million, two hundred fifty-six thousand, five hundred sixty-three".