13449681 has 36 divisors (see below), whose sum is σ = 22936576. Its totient is φ = 7439040.

The previous prime is 13449677. The next prime is 13449697. The reversal of 13449681 is 18694431.

It is not a de Polignac number, because 13449681 - 2² = 13449677 is a prime.

It is a super-2 number, since 2×13449681² = 361787838003522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13449281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 105840 + ... + 105966.

Almost surely, 2^13449681 is an apocalyptic number.

It is an amenable number.

13449681 is a deficient number, since it is larger than the sum of its proper divisors (9486895).

13449681 is a wasteful number, since it uses less digits than its factorization.

13449681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 178 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 13449681 is about 3667.3806729054. The cubic root of 13449681 is about 237.8139508264.

It can be divided in two parts, 1344 and 9681, that added together give a square (11025 = 105²).

The spelling of 13449681 in words is "thirteen million, four hundred forty-nine thousand, six hundred eighty-one".