1212217 has 4 divisors (see below), whose sum is σ = 1214836. Its totient is φ = 1209600.

The previous prime is 1212199. The next prime is 1212221. The reversal of 1212217 is 7122121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1022121 + 190096 = 1011^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212217 - 2¹¹ = 1210169 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 1212217.

It is not an unprimeable number, because it can be changed into a prime (1212227) 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, 408 + ... + 1609.

It is an arithmetic number, because the mean of its divisors is an integer number (303709).

2^1212217 is an apocalyptic number.

It is an amenable number.

1212217 is a deficient number, since it is larger than the sum of its proper divisors (2619).

1212217 is an equidigital number, since it uses as much as digits as its factorization.

1212217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2618.

The product of its digits is 56, while the sum is 16.

The square root of 1212217 is about 1101.0072660977. The cubic root of 1212217 is about 106.6252649654.

Subtracting from 1212217 its sum of digits (16), we obtain a square (1212201 = 1101²).

Adding to 1212217 its reverse (7122121), we get a palindrome (8334338).

The spelling of 1212217 in words is "one million, two hundred twelve thousand, two hundred seventeen".