1223561 has 2 divisors, whose sum is σ = 1223562. Its totient is φ = 1223560.

The previous prime is 1223549. The next prime is 1223569. The reversal of 1223561 is 1653221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 712336 + 511225 = 844^2 + 715^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223561 - 2¹⁰ = 1222537 is a prime.

It is not a weakly prime, because it can be changed into another prime (1223569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611780 + 611781.

It is an arithmetic number, because the mean of its divisors is an integer number (611781).

2^1223561 is an apocalyptic number.

It is an amenable number.

1223561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223561 is an equidigital number, since it uses as much as digits as its factorization.

1223561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 20.

The square root of 1223561 is about 1106.1469161011. The cubic root of 1223561 is about 106.9568347157.

Adding to 1223561 its reverse (1653221), we get a palindrome (2876782).

The spelling of 1223561 in words is "one million, two hundred twenty-three thousand, five hundred sixty-one".