1221029 has 2 divisors, whose sum is σ = 1221030. Its totient is φ = 1221028.

The previous prime is 1221019. The next prime is 1221049. The reversal of 1221029 is 9201221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1221025 + 4 = 1105^2 + 2^2 .

It is an emirp because it is prime and its reverse (9201221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221029 - 2⁸ = 1220773 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1220998 and 1221016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610514 + 610515.

It is an arithmetic number, because the mean of its divisors is an integer number (610515).

2^1221029 is an apocalyptic number.

It is an amenable number.

1221029 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221029 is an equidigital number, since it uses as much as digits as its factorization.

1221029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1221029 is about 1105.0018099533. The cubic root of 1221029 is about 106.8830060234.

The spelling of 1221029 in words is "one million, two hundred twenty-one thousand, twenty-nine".