13651261 has 16 divisors (see below), whose sum is σ = 15302448. Its totient is φ = 12096000.

The previous prime is 13651249. The next prime is 13651271. The reversal of 13651261 is 16215631.

13651261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 2220100 + 11431161 = 1490^2 + 3381^2 .

It is a 5-Lehmer number, since φ(13651261) divides (13651261-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 13651261 - 2⁵ = 13651229 is a prime.

It is a deceptive number, since it divides R_13651260.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13651271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48441 + ... + 48721.

It is an arithmetic number, because the mean of its divisors is an integer number (956403).

Almost surely, 2^13651261 is an apocalyptic number.

It is an amenable number.

13651261 is a deficient number, since it is larger than the sum of its proper divisors (1651187).

13651261 is a wasteful number, since it uses less digits than its factorization.

13651261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432.

The product of its digits is 1080, while the sum is 25.

The square root of 13651261 is about 3694.7612913421. The cubic root of 13651261 is about 238.9961601363.

Adding to 13651261 its reverse (16215631), we get a palindrome (29866892).

The spelling of 13651261 in words is "thirteen million, six hundred fifty-one thousand, two hundred sixty-one".