13049681 has 4 divisors (see below), whose sum is σ = 13499700. Its totient is φ = 12599664.

The previous prime is 13049677. The next prime is 13049719. The reversal of 13049681 is 18694031.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10784656 + 2265025 = 3284^2 + 1505^2 .

It is a cyclic number.

It is not a de Polignac number, because 13049681 - 2² = 13049677 is a prime.

It is a super-2 number, since 2×13049681² = 340588348403522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13049611) 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 3 ways as a sum of consecutive naturals, for example, 224966 + ... + 225023.

It is an arithmetic number, because the mean of its divisors is an integer number (3374925).

Almost surely, 2^13049681 is an apocalyptic number.

It is an amenable number.

13049681 is a deficient number, since it is larger than the sum of its proper divisors (450019).

13049681 is an equidigital number, since it uses as much as digits as its factorization.

13049681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450018.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 13049681 is about 3612.4342208544. The cubic root of 13049681 is about 235.4326179113.

The spelling of 13049681 in words is "thirteen million, forty-nine thousand, six hundred eighty-one".