13561761 has 4 divisors (see below), whose sum is σ = 18082352. Its totient is φ = 9041172.

The previous prime is 13561759. The next prime is 13561783. The reversal of 13561761 is 16716531.

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 not a de Polignac number, because 13561761 - 2¹ = 13561759 is a prime.

It is a super-2 number, since 2×13561761² = 367842722842242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13561711) 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, 2260291 + ... + 2260296.

It is an arithmetic number, because the mean of its divisors is an integer number (4520588).

Almost surely, 2^13561761 is an apocalyptic number.

It is an amenable number.

13561761 is a deficient number, since it is larger than the sum of its proper divisors (4520591).

13561761 is an equidigital number, since it uses as much as digits as its factorization.

13561761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4520590.

The product of its digits is 3780, while the sum is 30.

The square root of 13561761 is about 3682.6296311196. The cubic root of 13561761 is about 238.4727146420.

The spelling of 13561761 in words is "thirteen million, five hundred sixty-one thousand, seven hundred sixty-one".