1281556 has 6 divisors (see below), whose sum is σ = 2242730. Its totient is φ = 640776.

The previous prime is 1281551. The next prime is 1281563. The reversal of 1281556 is 6551821.

It can be written as a sum of positive squares in only one way, i.e., 1245456 + 36100 = 1116^2 + 190^2 .

It is a super-2 number, since 2×1281556² = 3284771562272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160191 + ... + 160198.

2^1281556 is an apocalyptic number.

It is an amenable number.

1281556 is a deficient number, since it is larger than the sum of its proper divisors (961174).

1281556 is a wasteful number, since it uses less digits than its factorization.

1281556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320393 (or 320391 counting only the distinct ones).

The product of its digits is 2400, while the sum is 28.

The square root of 1281556 is about 1132.0583023855. The cubic root of 1281556 is about 108.6206830337.

The spelling of 1281556 in words is "one million, two hundred eighty-one thousand, five hundred fifty-six".