1123561 has 2 divisors, whose sum is σ = 1123562. Its totient is φ = 1123560.

The previous prime is 1123553. The next prime is 1123567. The reversal of 1123561 is 1653211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 570025 + 553536 = 755^2 + 744^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123561 - 2³ = 1123553 is a prime.

It is not a weakly prime, because it can be changed into another prime (1123567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561780 + 561781.

It is an arithmetic number, because the mean of its divisors is an integer number (561781).

2^1123561 is an apocalyptic number.

It is an amenable number.

1123561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123561 is an equidigital number, since it uses as much as digits as its factorization.

1123561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180, while the sum is 19.

The square root of 1123561 is about 1059.9816036139. The cubic root of 1123561 is about 103.9598279265.

Adding to 1123561 its reverse (1653211), we get a palindrome (2776772).

It can be divided in two parts, 1123 and 561, that multiplied together give a triangular number (630003 = T₁₁₂₂).

The spelling of 1123561 in words is "one million, one hundred twenty-three thousand, five hundred sixty-one".