13663261 has 4 divisors (see below), whose sum is σ = 14382400. Its totient is φ = 12944124.

The previous prime is 13663253. The next prime is 13663267. The reversal of 13663261 is 16236631.

13663261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16236631 = 113 ⋅143687.

It is a cyclic number.

It is not a de Polignac number, because 13663261 - 2³ = 13663253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13663267) 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, 359541 + ... + 359578.

It is an arithmetic number, because the mean of its divisors is an integer number (3595600).

Almost surely, 2^13663261 is an apocalyptic number.

It is an amenable number.

13663261 is a deficient number, since it is larger than the sum of its proper divisors (719139).

13663261 is an equidigital number, since it uses as much as digits as its factorization.

13663261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719138.

The product of its digits is 3888, while the sum is 28.

The square root of 13663261 is about 3696.3848555041. The cubic root of 13663261 is about 239.0661686623.

Adding to 13663261 its reverse (16236631), we get a palindrome (29899892).

It can be divided in two parts, 13663 and 261, that added together give a square (13924 = 118²).

The spelling of 13663261 in words is "thirteen million, six hundred sixty-three thousand, two hundred sixty-one".