10765561 has 4 divisors (see below), whose sum is σ = 10776052. Its totient is φ = 10755072.

The previous prime is 10765543. The next prime is 10765577. The reversal of 10765561 is 16556701.

It is the 1340-th star number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16556701 = 7 ⋅2365243.

It can be written as a sum of positive squares in 2 ways, for example, as 9486400 + 1279161 = 3080^2 + 1131^2 .

It is a cyclic number.

It is not a de Polignac number, because 10765561 - 2¹⁵ = 10732793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10765501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3516 + ... + 5821.

It is an arithmetic number, because the mean of its divisors is an integer number (2694013).

Almost surely, 2^10765561 is an apocalyptic number.

It is an amenable number.

10765561 is a deficient number, since it is larger than the sum of its proper divisors (10491).

10765561 is an equidigital number, since it uses as much as digits as its factorization.

10765561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10490.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 10765561 is about 3281.0914342639. The cubic root of 10765561 is about 220.8066872165.

The spelling of 10765561 in words is "ten million, seven hundred sixty-five thousand, five hundred sixty-one".