13661567 has 4 divisors (see below), whose sum is σ = 13718496. Its totient is φ = 13604640.

The previous prime is 13661561. The next prime is 13661603. The reversal of 13661567 is 76516631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76516631 = 61 ⋅1254371.

It is a cyclic number.

It is not a de Polignac number, because 13661567 - 2⁸ = 13661311 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 (13661561) 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, 28103 + ... + 28584.

It is an arithmetic number, because the mean of its divisors is an integer number (3429624).

Almost surely, 2^13661567 is an apocalyptic number.

13661567 is a deficient number, since it is larger than the sum of its proper divisors (56929).

13661567 is an equidigital number, since it uses as much as digits as its factorization.

13661567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56928.

The product of its digits is 22680, while the sum is 35.

The square root of 13661567 is about 3696.1557055947. The cubic root of 13661567 is about 239.0562882775.

The spelling of 13661567 in words is "thirteen million, six hundred sixty-one thousand, five hundred sixty-seven".