1213213 has 2 divisors, whose sum is σ = 1213214. Its totient is φ = 1213212.

The previous prime is 1213189. The next prime is 1213241. The reversal of 1213213 is 3123121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1085764 + 127449 = 1042^2 + 357^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213213 - 2¹⁷ = 1082141 is a prime.

1213213 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1213193 and 1213202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606606 + 606607.

It is an arithmetic number, because the mean of its divisors is an integer number (606607).

2^1213213 is an apocalyptic number.

It is an amenable number.

1213213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213213 is an equidigital number, since it uses as much as digits as its factorization.

1213213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 13.

The square root of 1213213 is about 1101.4594863180. The cubic root of 1213213 is about 106.6544593235.

Adding to 1213213 its reverse (3123121), we get a palindrome (4336334).

It can be divided in two parts, 12 and 13213, that added together give a square (13225 = 115²).

The spelling of 1213213 in words is "one million, two hundred thirteen thousand, two hundred thirteen".