11465561 has 4 divisors (see below), whose sum is σ = 11473872. Its totient is φ = 11457252.

The previous prime is 11465557. The next prime is 11465593. The reversal of 11465561 is 16556411.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16556411 = 347 ⋅47713.

It is a cyclic number.

It is not a de Polignac number, because 11465561 - 2² = 11465557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11465501) 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, 1535 + ... + 5028.

It is an arithmetic number, because the mean of its divisors is an integer number (2868468).

Almost surely, 2^11465561 is an apocalyptic number.

It is an amenable number.

11465561 is a deficient number, since it is larger than the sum of its proper divisors (8311).

11465561 is an equidigital number, since it uses as much as digits as its factorization.

11465561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8310.

The product of its digits is 3600, while the sum is 29.

The square root of 11465561 is about 3386.0834307500. The cubic root of 11465561 is about 225.4923277020.

The spelling of 11465561 in words is "eleven million, four hundred sixty-five thousand, five hundred sixty-one".