1106561 has 4 divisors (see below), whose sum is σ = 1108992. Its totient is φ = 1104132.

The previous prime is 1106543. The next prime is 1106563. The reversal of 1106561 is 1656011.

It is a happy number.

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: 1656011 = 7 ⋅236573.

It is a cyclic number.

It is not a de Polignac number, because 1106561 - 2¹⁰ = 1105537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1106563) 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, 305 + ... + 1518.

It is an arithmetic number, because the mean of its divisors is an integer number (277248).

2^1106561 is an apocalyptic number.

It is an amenable number.

1106561 is a deficient number, since it is larger than the sum of its proper divisors (2431).

1106561 is an equidigital number, since it uses as much as digits as its factorization.

1106561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 1106561 is about 1051.9320320249. The cubic root of 1106561 is about 103.4328409015.

The spelling of 1106561 in words is "one million, one hundred six thousand, five hundred sixty-one".