13617257 has 4 divisors (see below), whose sum is σ = 13628160. Its totient is φ = 13606356.

The previous prime is 13617251. The next prime is 13617271. The reversal of 13617257 is 75271631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13617257 - 2¹⁶ = 13551721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13617251) 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 3 ways as a sum of consecutive naturals, for example, 3293 + ... + 6170.

It is an arithmetic number, because the mean of its divisors is an integer number (3407040).

Almost surely, 2^13617257 is an apocalyptic number.

It is an amenable number.

13617257 is a deficient number, since it is larger than the sum of its proper divisors (10903).

13617257 is an equidigital number, since it uses as much as digits as its factorization.

13617257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10902.

The product of its digits is 8820, while the sum is 32.

The square root of 13617257 is about 3690.1567717375. The cubic root of 13617257 is about 238.7975562002.

Adding to 13617257 its reverse (75271631), we get a palindrome (88888888).

The spelling of 13617257 in words is "thirteen million, six hundred seventeen thousand, two hundred fifty-seven".