1311681682081 has 4 divisors (see below), whose sum is σ = 1311712283952. Its totient is φ = 1311651080212.

The previous prime is 1311681682079. The next prime is 1311681682111. The reversal of 1311681682081 is 1802861861131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1311681682081 - 2¹ = 1311681682079 is a prime.

It is a super-2 number, since 2×1311681682081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311681082081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15236551 + ... + 15322396.

It is an arithmetic number, because the mean of its divisors is an integer number (327928070988).

Almost surely, 2^{1311681682081} is an apocalyptic number.

It is an amenable number.

1311681682081 is a deficient number, since it is larger than the sum of its proper divisors (30601871).

1311681682081 is an equidigital number, since it uses as much as digits as its factorization.

1311681682081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30601870.

The product of its (nonzero) digits is 110592, while the sum is 46.

The spelling of 1311681682081 in words is "one trillion, three hundred eleven billion, six hundred eighty-one million, six hundred eighty-two thousand, eighty-one".