13263681 has 4 divisors (see below), whose sum is σ = 17684912. Its totient is φ = 8842452.

The previous prime is 13263667. The next prime is 13263703. The reversal of 13263681 is 18636231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13263681 - 2¹⁹ = 12739393 is a prime.

It is a super-2 number, since 2×13263681² = 351850467339522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13263611) 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, 2210611 + ... + 2210616.

It is an arithmetic number, because the mean of its divisors is an integer number (4421228).

Almost surely, 2^13263681 is an apocalyptic number.

It is an amenable number.

13263681 is a deficient number, since it is larger than the sum of its proper divisors (4421231).

13263681 is an equidigital number, since it uses as much as digits as its factorization.

13263681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4421230.

The product of its digits is 5184, while the sum is 30.

The square root of 13263681 is about 3641.9336896764. The cubic root of 13263681 is about 236.7125893385.

The spelling of 13263681 in words is "thirteen million, two hundred sixty-three thousand, six hundred eighty-one".