1213633 has 2 divisors, whose sum is σ = 1213634. Its totient is φ = 1213632.

The previous prime is 1213631. The next prime is 1213643. The reversal of 1213633 is 3363121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1106704 + 106929 = 1052^2 + 327^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213633 - 2¹ = 1213631 is a prime.

Together with 1213631, it forms a pair of twin primes.

1213633 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213633.

It is not a weakly prime, because it can be changed into another prime (1213631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606816 + 606817.

It is an arithmetic number, because the mean of its divisors is an integer number (606817).

2^1213633 is an apocalyptic number.

It is an amenable number.

1213633 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213633 is an equidigital number, since it uses as much as digits as its factorization.

1213633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 19.

The square root of 1213633 is about 1101.6501259474. The cubic root of 1213633 is about 106.6667654079. Note that the first 3 decimals are identical.

Adding to 1213633 its reverse (3363121), we get a palindrome (4576754).

The spelling of 1213633 in words is "one million, two hundred thirteen thousand, six hundred thirty-three".