13661015 has 8 divisors (see below), whose sum is σ = 16702848. Its totient is φ = 10722400.

The previous prime is 13661003. The next prime is 13661017. The reversal of 13661015 is 51016631.

It is a happy number.

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

It is not a de Polignac number, because 13661015 - 2¹⁰ = 13659991 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 (13661017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25511 + ... + 26040.

It is an arithmetic number, because the mean of its divisors is an integer number (2087856).

Almost surely, 2^13661015 is an apocalyptic number.

13661015 is a deficient number, since it is larger than the sum of its proper divisors (3041833).

13661015 is an equidigital number, since it uses as much as digits as its factorization.

13661015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51609.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 13661015 is about 3696.0810326615. The cubic root of 13661015 is about 239.0530685188.

Adding to 13661015 its reverse (51016631), we get a palindrome (64677646).

The spelling of 13661015 in words is "thirteen million, six hundred sixty-one thousand, fifteen".