13081617 has 6 divisors (see below), whose sum is σ = 18895682. Its totient is φ = 8721072.

The previous prime is 13081613. The next prime is 13081631. The reversal of 13081617 is 71618031.

It can be written as a sum of positive squares in only one way, i.e., 6548481 + 6533136 = 2559^2 + 2556^2 .

It is not a de Polignac number, because 13081617 - 2² = 13081613 is a prime.

It is a super-2 number, since 2×13081617² = 342257406669378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13081613) 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 5 ways as a sum of consecutive naturals, for example, 726748 + ... + 726765.

Almost surely, 2^13081617 is an apocalyptic number.

It is an amenable number.

13081617 is a deficient number, since it is larger than the sum of its proper divisors (5814065).

13081617 is a wasteful number, since it uses less digits than its factorization.

13081617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453519 (or 1453516 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 13081617 is about 3616.8518078572. The cubic root of 13081617 is about 235.6245166236.

Adding to 13081617 its reverse (71618031), we get a palindrome (84699648).

The spelling of 13081617 in words is "thirteen million, eighty-one thousand, six hundred seventeen".