1220569 has 4 divisors (see below), whose sum is σ = 1394944. Its totient is φ = 1046196.

The previous prime is 1220507. The next prime is 1220591. The reversal of 1220569 is 9650221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9650221 = 7 ⋅1378603.

It is a cyclic number.

It is not a de Polignac number, because 1220569 - 2¹⁵ = 1187801 is a prime.

It is a super-2 number, since 2×1220569² = 2979577367522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87177 + ... + 87190.

It is an arithmetic number, because the mean of its divisors is an integer number (348736).

2^1220569 is an apocalyptic number.

It is an amenable number.

1220569 is a deficient number, since it is larger than the sum of its proper divisors (174375).

1220569 is an equidigital number, since it uses as much as digits as its factorization.

1220569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174374.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1220569 is about 1104.7936458905. The cubic root of 1220569 is about 106.8695822750.

The spelling of 1220569 in words is "one million, two hundred twenty thousand, five hundred sixty-nine".