1221269 has 4 divisors (see below), whose sum is σ = 1395744. Its totient is φ = 1046796.

The previous prime is 1221251. The next prime is 1221289. The reversal of 1221269 is 9621221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221269 - 2¹⁶ = 1155733 is a prime.

It is a super-2 number, since 2×1221269² = 2982995940722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87227 + ... + 87240.

It is an arithmetic number, because the mean of its divisors is an integer number (348936).

2^1221269 is an apocalyptic number.

It is an amenable number.

1221269 is a deficient number, since it is larger than the sum of its proper divisors (174475).

1221269 is an equidigital number, since it uses as much as digits as its factorization.

1221269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174474.

The product of its digits is 432, while the sum is 23.

The square root of 1221269 is about 1105.1104017246. The cubic root of 1221269 is about 106.8900083798.

The spelling of 1221269 in words is "one million, two hundred twenty-one thousand, two hundred sixty-nine".