13125661 has 8 divisors (see below), whose sum is σ = 13622400. Its totient is φ = 12631920.

The previous prime is 13125653. The next prime is 13125667. The reversal of 13125661 is 16652131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13125661 - 2³ = 13125653 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 (13125667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12216 + ... + 13246.

It is an arithmetic number, because the mean of its divisors is an integer number (1702800).

Almost surely, 2^13125661 is an apocalyptic number.

It is an amenable number.

13125661 is a deficient number, since it is larger than the sum of its proper divisors (496739).

13125661 is a wasteful number, since it uses less digits than its factorization.

13125661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499.

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

The square root of 13125661 is about 3622.9354120657. The cubic root of 13125661 is about 235.8886588169. Note that the first 3 decimals are identical.

Adding to 13125661 its reverse (16652131), we get a palindrome (29777792).

The spelling of 13125661 in words is "thirteen million, one hundred twenty-five thousand, six hundred sixty-one".