12217505 has 4 divisors (see below), whose sum is σ = 14661012. Its totient is φ = 9774000.

The previous prime is 12217481. The next prime is 12217529. The reversal of 12217505 is 50571221.

It is a happy number.

12217505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50571221 = 137 ⋅369133.

It is an interprime number because it is at equal distance from previous prime (12217481) and next prime (12217529).

It can be written as a sum of positive squares in 2 ways, for example, as 8340544 + 3876961 = 2888^2 + 1969^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12217505 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1221746 + ... + 1221755.

It is an arithmetic number, because the mean of its divisors is an integer number (3665253).

Almost surely, 2^12217505 is an apocalyptic number.

It is an amenable number.

12217505 is a deficient number, since it is larger than the sum of its proper divisors (2443507).

12217505 is an equidigital number, since it uses as much as digits as its factorization.

12217505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2443506.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 12217505 is about 3495.3547745544. The cubic root of 12217505 is about 230.3178026397.

Adding to 12217505 its reverse (50571221), we get a palindrome (62788726).

The spelling of 12217505 in words is "twelve million, two hundred seventeen thousand, five hundred five".