1256553 has 12 divisors (see below), whose sum is σ = 1882608. Its totient is φ = 837540.

The previous prime is 1256543. The next prime is 1256573. The reversal of 1256553 is 3556521.

1256553 is a `hidden beast` number, since 1 + 2 + 5 + 655 + 3 = 666.

It is not a de Polignac number, because 1256553 - 2⁹ = 1256041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2343 + ... + 2828.

It is an arithmetic number, because the mean of its divisors is an integer number (156884).

2^1256553 is an apocalyptic number.

It is an amenable number.

1256553 is a deficient number, since it is larger than the sum of its proper divisors (626055).

1256553 is an frugal number, since it uses more digits than its factorization.

1256553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5186 (or 5174 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 1256553 is about 1120.9607486438. The cubic root of 1256553 is about 107.9096466532.

Subtracting 1256553 from its reverse (3556521), we obtain a cube (2299968 = 132³).

It can be divided in two parts, 12 and 56553, that added together give a palindrome (56565).

The spelling of 1256553 in words is "one million, two hundred fifty-six thousand, five hundred fifty-three".