1256481 has 6 divisors (see below), whose sum is σ = 1814930. Its totient is φ = 837648.

The previous prime is 1256477. The next prime is 1256531. The reversal of 1256481 is 1846521.

1256481 is a `hidden beast` number, since 12 + 5 + 648 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1245456 + 11025 = 1116^2 + 105^2 .

It is not a de Polignac number, because 1256481 - 2² = 1256477 is a prime.

It is a super-2 number, since 2×1256481² = 3157489006722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256681) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69796 + ... + 69813.

2^1256481 is an apocalyptic number.

It is an amenable number.

1256481 is a deficient number, since it is larger than the sum of its proper divisors (558449).

1256481 is a wasteful number, since it uses less digits than its factorization.

1256481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139615 (or 139612 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 1256481 is about 1120.9286328754. The cubic root of 1256481 is about 107.9075855536.

The spelling of 1256481 in words is "one million, two hundred fifty-six thousand, four hundred eighty-one".