13117618 has 4 divisors (see below), whose sum is σ = 19676430. Its totient is φ = 6558808.

The previous prime is 13117579. The next prime is 13117661. The reversal of 13117618 is 81671131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81671131 = 61 ⋅1338871.

It can be written as a sum of positive squares in only one way, i.e., 8720209 + 4397409 = 2953^2 + 2097^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3279403 + ... + 3279406.

Almost surely, 2^13117618 is an apocalyptic number.

13117618 is a deficient number, since it is larger than the sum of its proper divisors (6558812).

13117618 is an equidigital number, since it uses as much as digits as its factorization.

13117618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6558811.

The product of its digits is 1008, while the sum is 28.

The square root of 13117618 is about 3621.8252304605. The cubic root of 13117618 is about 235.8404672086.

Adding to 13117618 its reverse (81671131), we get a palindrome (94788749).

The spelling of 13117618 in words is "thirteen million, one hundred seventeen thousand, six hundred eighteen".