11020561 has 4 divisors (see below), whose sum is σ = 11318452. Its totient is φ = 10722672.

The previous prime is 11020543. The next prime is 11020567. The reversal of 11020561 is 16502011.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16502011 = 881 ⋅18731.

It can be written as a sum of positive squares in 2 ways, for example, as 8065600 + 2954961 = 2840^2 + 1719^2 .

It is a cyclic number.

It is not a de Polignac number, because 11020561 - 2⁹ = 11020049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11020567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148890 + ... + 148963.

It is an arithmetic number, because the mean of its divisors is an integer number (2829613).

Almost surely, 2^11020561 is an apocalyptic number.

It is an amenable number.

11020561 is a deficient number, since it is larger than the sum of its proper divisors (297891).

11020561 is an equidigital number, since it uses as much as digits as its factorization.

11020561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297890.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 11020561 is about 3319.7230306157. The cubic root of 11020561 is about 222.5364902489.

Adding to 11020561 its reverse (16502011), we get a palindrome (27522572).

The spelling of 11020561 in words is "eleven million, twenty thousand, five hundred sixty-one".