13613261 has 4 divisors (see below), whose sum is σ = 13816512. Its totient is φ = 13410012.

The previous prime is 13613239. The next prime is 13613269. The reversal of 13613261 is 16231631.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-13613261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13613269) 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, 101525 + ... + 101658.

It is an arithmetic number, because the mean of its divisors is an integer number (3454128).

Almost surely, 2^13613261 is an apocalyptic number.

It is an amenable number.

13613261 is a deficient number, since it is larger than the sum of its proper divisors (203251).

13613261 is an equidigital number, since it uses as much as digits as its factorization.

13613261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203250.

The product of its digits is 648, while the sum is 23.

The square root of 13613261 is about 3689.6152915988. The cubic root of 13613261 is about 238.7741954409.

Adding to 13613261 its reverse (16231631), we get a palindrome (29844892).

The spelling of 13613261 in words is "thirteen million, six hundred thirteen thousand, two hundred sixty-one".