1321633 has 2 divisors, whose sum is σ = 1321634. Its totient is φ = 1321632.

The previous prime is 1321627. The next prime is 1321637. The reversal of 1321633 is 3361231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 762129 + 559504 = 873^2 + 748^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321633 - 2⁵ = 1321601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321633.

It is not a weakly prime, because it can be changed into another prime (1321637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660816 + 660817.

It is an arithmetic number, because the mean of its divisors is an integer number (660817).

2^1321633 is an apocalyptic number.

It is an amenable number.

1321633 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321633 is an equidigital number, since it uses as much as digits as its factorization.

1321633 is an evil number, because the sum of its binary digits is even.

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

The square root of 1321633 is about 1149.6229816770. The cubic root of 1321633 is about 109.7413482109.

Adding to 1321633 its reverse (3361231), we get a palindrome (4682864).

The spelling of 1321633 in words is "one million, three hundred twenty-one thousand, six hundred thirty-three".