1311556 has 6 divisors (see below), whose sum is σ = 2295230. Its totient is φ = 655776.

The previous prime is 1311553. The next prime is 1311559. The reversal of 1311556 is 6551131.

It is an interprime number because it is at equal distance from previous prime (1311553) and next prime (1311559).

It can be written as a sum of positive squares in only one way, i.e., 1285956 + 25600 = 1134^2 + 160^2 .

It is a super-3 number, since 3×1311556³ = 6768333820895302848, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1311553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163941 + ... + 163948.

2^1311556 is an apocalyptic number.

It is an amenable number.

1311556 is a deficient number, since it is larger than the sum of its proper divisors (983674).

1311556 is a wasteful number, since it uses less digits than its factorization.

1311556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327893 (or 327891 counting only the distinct ones).

The product of its digits is 450, while the sum is 22.

The square root of 1311556 is about 1145.2318542548. The cubic root of 1311556 is about 109.4617228931.

Adding to 1311556 its reverse (6551131), we get a palindrome (7862687).

The spelling of 1311556 in words is "one million, three hundred eleven thousand, five hundred fifty-six".