13718609 has 4 divisors (see below), whose sum is σ = 14525604. Its totient is φ = 12911616.

The previous prime is 13718599. The next prime is 13718623. The reversal of 13718609 is 90681731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90681731 = 7 ⋅12954533.

It can be written as a sum of positive squares in 2 ways, for example, as 10923025 + 2795584 = 3305^2 + 1672^2 .

It is a cyclic number.

It is not a de Polignac number, because 13718609 - 2¹² = 13714513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13718629) 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, 403472 + ... + 403505.

It is an arithmetic number, because the mean of its divisors is an integer number (3631401).

Almost surely, 2^13718609 is an apocalyptic number.

It is an amenable number.

13718609 is a deficient number, since it is larger than the sum of its proper divisors (806995).

13718609 is an equidigital number, since it uses as much as digits as its factorization.

13718609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806994.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 13718609 is about 3703.8640633803. The cubic root of 13718609 is about 239.3885418649.

The spelling of 13718609 in words is "thirteen million, seven hundred eighteen thousand, six hundred nine".