1311656 has 16 divisors (see below), whose sum is σ = 2480640. Its totient is φ = 650160.

The previous prime is 1311643. The next prime is 1311689. The reversal of 1311656 is 6561131.

It is a happy number.

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371 + ... + 1661.

It is an arithmetic number, because the mean of its divisors is an integer number (155040).

2^1311656 is an apocalyptic number.

It is an amenable number.

1311656 is a deficient number, since it is larger than the sum of its proper divisors (1168984).

1311656 is a wasteful number, since it uses less digits than its factorization.

1311656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424 (or 1420 counting only the distinct ones).

The product of its digits is 540, while the sum is 23.

The square root of 1311656 is about 1145.2755127043. The cubic root of 1311656 is about 109.4645048036.

Adding to 1311656 its reverse (6561131), we get a palindrome (7872787).

It can be divided in two parts, 1311 and 656, that multiplied together give a triangular number (860016 = T₁₃₁₁).

The spelling of 1311656 in words is "one million, three hundred eleven thousand, six hundred fifty-six".