13216261 has 4 divisors (see below), whose sum is σ = 13642624. Its totient is φ = 12789900.

The previous prime is 13216249. The next prime is 13216303. The reversal of 13216261 is 16261231.

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 a cyclic number.

It is not a de Polignac number, because 13216261 - 2²¹ = 11119109 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 (13216201) 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, 213135 + ... + 213196.

It is an arithmetic number, because the mean of its divisors is an integer number (3410656).

Almost surely, 2^13216261 is an apocalyptic number.

It is an amenable number.

13216261 is a deficient number, since it is larger than the sum of its proper divisors (426363).

13216261 is an equidigital number, since it uses as much as digits as its factorization.

13216261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426362.

The product of its digits is 432, while the sum is 22.

The square root of 13216261 is about 3635.4175826169. The cubic root of 13216261 is about 236.4301560625.

Adding to 13216261 its reverse (16261231), we get a palindrome (29477492).

The spelling of 13216261 in words is "thirteen million, two hundred sixteen thousand, two hundred sixty-one".