13217705 has 8 divisors (see below), whose sum is σ = 16025352. Its totient is φ = 10464768.

The previous prime is 13217683. The next prime is 13217717. The reversal of 13217705 is 50771231.

It can be written as a sum of positive squares in 4 ways, for example, as 1183744 + 12033961 = 1088^2 + 3469^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13217705 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13142 + ... + 14111.

It is an arithmetic number, because the mean of its divisors is an integer number (2003169).

Almost surely, 2^13217705 is an apocalyptic number.

It is an amenable number.

13217705 is a deficient number, since it is larger than the sum of its proper divisors (2807647).

13217705 is an equidigital number, since it uses as much as digits as its factorization.

13217705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27355.

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 13217705 is about 3635.6161788616. The cubic root of 13217705 is about 236.4387664834.

Adding to 13217705 its reverse (50771231), we get a palindrome (63988936).

The spelling of 13217705 in words is "thirteen million, two hundred seventeen thousand, seven hundred five".