13705521 has 8 divisors (see below), whose sum is σ = 18719904. Its totient is φ = 8914080.

The previous prime is 13705513. The next prime is 13705561. The reversal of 13705521 is 12550731.

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

It is not a de Polignac number, because 13705521 - 2³ = 13705513 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 13705491 and 13705500.

It is not an unprimeable number, because it can be changed into a prime (13705511) 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, 55591 + ... + 55836.

It is an arithmetic number, because the mean of its divisors is an integer number (2339988).

Almost surely, 2^13705521 is an apocalyptic number.

It is an amenable number.

13705521 is a deficient number, since it is larger than the sum of its proper divisors (5014383).

13705521 is a wasteful number, since it uses less digits than its factorization.

13705521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111471.

The product of its (nonzero) digits is 1050, while the sum is 24.

The square root of 13705521 is about 3702.0968382796. The cubic root of 13705521 is about 239.3123894861.

The spelling of 13705521 in words is "thirteen million, seven hundred five thousand, five hundred twenty-one".