1231217 has 4 divisors (see below), whose sum is σ = 1325940. Its totient is φ = 1136496.

The previous prime is 1231207. The next prime is 1231229. The reversal of 1231217 is 7121321.

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 440896 + 790321 = 664^2 + 889^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231217 - 2⁴ = 1231201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231195 and 1231204.

It is not an unprimeable number, because it can be changed into a prime (1231207) 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, 47342 + ... + 47367.

It is an arithmetic number, because the mean of its divisors is an integer number (331485).

2^1231217 is an apocalyptic number.

It is an amenable number.

1231217 is a deficient number, since it is larger than the sum of its proper divisors (94723).

1231217 is an equidigital number, since it uses as much as digits as its factorization.

1231217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94722.

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

The square root of 1231217 is about 1109.6021809640. The cubic root of 1231217 is about 107.1794525574.

Adding to 1231217 its reverse (7121321), we get a palindrome (8352538).

The spelling of 1231217 in words is "one million, two hundred thirty-one thousand, two hundred seventeen".