1180561 has 4 divisors (see below), whose sum is σ = 1221300. Its totient is φ = 1139824.

The previous prime is 1180549. The next prime is 1180577. The reversal of 1180561 is 1650811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1650811 = 683 ⋅2417.

It can be written as a sum of positive squares in 2 ways, for example, as 490000 + 690561 = 700^2 + 831^2 .

It is a cyclic number.

It is not a de Polignac number, because 1180561 - 2¹⁵ = 1147793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1180591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20326 + ... + 20383.

It is an arithmetic number, because the mean of its divisors is an integer number (305325).

2^1180561 is an apocalyptic number.

It is an amenable number.

1180561 is a deficient number, since it is larger than the sum of its proper divisors (40739).

1180561 is an equidigital number, since it uses as much as digits as its factorization.

1180561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40738.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 1180561 is about 1086.5362396165. The cubic root of 1180561 is about 105.6889242267.

The spelling of 1180561 in words is "one million, one hundred eighty thousand, five hundred sixty-one".