13063681 has 4 divisors (see below), whose sum is σ = 13105732. Its totient is φ = 13021632.

The previous prime is 13063663. The next prime is 13063693. The reversal of 13063681 is 18636031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18636031 = 167 ⋅111593.

It can be written as a sum of positive squares in 2 ways, for example, as 6350400 + 6713281 = 2520^2 + 2591^2 .

It is a cyclic number.

It is not a de Polignac number, because 13063681 - 2⁵ = 13063649 is a prime.

It is a super-2 number, since 2×13063681² = 341319522539522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13063781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20556 + ... + 21181.

It is an arithmetic number, because the mean of its divisors is an integer number (3276433).

Almost surely, 2^13063681 is an apocalyptic number.

It is an amenable number.

13063681 is a deficient number, since it is larger than the sum of its proper divisors (42051).

13063681 is an equidigital number, since it uses as much as digits as its factorization.

13063681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42050.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 13063681 is about 3614.3714529638. The cubic root of 13063681 is about 235.5167803430.

The spelling of 13063681 in words is "thirteen million, sixty-three thousand, six hundred eighty-one".