13681081 has 4 divisors (see below), whose sum is σ = 13694692. Its totient is φ = 13667472.

The previous prime is 13681037. The next prime is 13681091. The reversal of 13681081 is 18018631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18018631 = 19 ⋅948349.

It can be written as a sum of positive squares in 2 ways, for example, as 13213225 + 467856 = 3635^2 + 684^2 .

It is a cyclic number.

It is not a de Polignac number, because 13681081 - 2²³ = 5292473 is a prime.

It is a super-2 number, since 2×13681081² = 374343954657122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13681091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5166 + ... + 7351.

It is an arithmetic number, because the mean of its divisors is an integer number (3423673).

Almost surely, 2^13681081 is an apocalyptic number.

13681081 is the 2136-th hex number.

It is an amenable number.

13681081 is a deficient number, since it is larger than the sum of its proper divisors (13611).

13681081 is a wasteful number, since it uses less digits than its factorization.

13681081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13610.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 13681081 is about 3698.7945333581. The cubic root of 13681081 is about 239.1700557308.

The spelling of 13681081 in words is "thirteen million, six hundred eighty-one thousand, eighty-one".