1312217 has 4 divisors (see below), whose sum is σ = 1319076. Its totient is φ = 1305360.

The previous prime is 1312211. The next prime is 1312229. The reversal of 1312217 is 7122131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7122131 = 19 ⋅374849.

It can be written as a sum of positive squares in 2 ways, for example, as 1263376 + 48841 = 1124^2 + 221^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312217 - 2⁶ = 1312153 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312195 and 1312204.

It is not an unprimeable number, because it can be changed into a prime (1312211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3134 + ... + 3527.

It is an arithmetic number, because the mean of its divisors is an integer number (329769).

2^1312217 is an apocalyptic number.

It is an amenable number.

1312217 is a deficient number, since it is larger than the sum of its proper divisors (6859).

1312217 is an equidigital number, since it uses as much as digits as its factorization.

1312217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6858.

The product of its digits is 84, while the sum is 17.

The square root of 1312217 is about 1145.5204057545. The cubic root of 1312217 is about 109.4801087003.

Adding to 1312217 its reverse (7122131), we get a palindrome (8434348).

The spelling of 1312217 in words is "one million, three hundred twelve thousand, two hundred seventeen".