1311481 has 2 divisors, whose sum is σ = 1311482. Its totient is φ = 1311480.

The previous prime is 1311473. The next prime is 1311493. The reversal of 1311481 is 1841131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1299600 + 11881 = 1140^2 + 109^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311481 - 2³ = 1311473 is a prime.

It is a super-2 number, since 2×1311481² = 3439964826722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1311181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655740 + 655741.

It is an arithmetic number, because the mean of its divisors is an integer number (655741).

2^1311481 is an apocalyptic number.

It is an amenable number.

1311481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311481 is an equidigital number, since it uses as much as digits as its factorization.

1311481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 19.

The square root of 1311481 is about 1145.1991093255. The cubic root of 1311481 is about 109.4596363675.

The spelling of 1311481 in words is "one million, three hundred eleven thousand, four hundred eighty-one".