1229521 has 2 divisors, whose sum is σ = 1229522. Its totient is φ = 1229520.

The previous prime is 1229519. The next prime is 1229531. The reversal of 1229521 is 1259221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 746496 + 483025 = 864^2 + 695^2 .

It is a cyclic number.

It is not a de Polignac number, because 1229521 - 2¹ = 1229519 is a prime.

Together with 1229519, it forms a pair of twin primes.

It is a Chen prime.

1229521 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1229492 and 1229501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1229531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614760 + 614761.

It is an arithmetic number, because the mean of its divisors is an integer number (614761).

2^1229521 is an apocalyptic number.

It is an amenable number.

1229521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1229521 is an equidigital number, since it uses as much as digits as its factorization.

1229521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 22.

The square root of 1229521 is about 1108.8376797350. The cubic root of 1229521 is about 107.1302167522.

Adding to 1229521 its product of digits (360), we get a square (1229881 = 1109²).

The spelling of 1229521 in words is "one million, two hundred twenty-nine thousand, five hundred twenty-one".