13561521 has 8 divisors (see below), whose sum is σ = 18466944. Its totient is φ = 8848560.

The previous prime is 13561511. The next prime is 13561523. The reversal of 13561521 is 12516531.

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

It is not a de Polignac number, because 13561521 - 2¹⁷ = 13430449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13561491 and 13561500.

It is not an unprimeable number, because it can be changed into a prime (13561523) 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, 47950 + ... + 48231.

It is an arithmetic number, because the mean of its divisors is an integer number (2308368).

Almost surely, 2^13561521 is an apocalyptic number.

It is an amenable number.

13561521 is a deficient number, since it is larger than the sum of its proper divisors (4905423).

13561521 is an equidigital number, since it uses as much as digits as its factorization.

13561521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96231.

The product of its digits is 900, while the sum is 24.

The square root of 13561521 is about 3682.5970455644. The cubic root of 13561521 is about 238.4713078977.

The spelling of 13561521 in words is "thirteen million, five hundred sixty-one thousand, five hundred twenty-one".