11335561 has 4 divisors (see below), whose sum is σ = 11422224. Its totient is φ = 11248900.

The previous prime is 11335543. The next prime is 11335567. The reversal of 11335561 is 16553311.

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: 16553311 = 977 ⋅16943.

It is a cyclic number.

It is not a de Polignac number, because 11335561 - 2¹⁵ = 11302793 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (11335567) 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, 43135 + ... + 43396.

It is an arithmetic number, because the mean of its divisors is an integer number (2855556).

Almost surely, 2^11335561 is an apocalyptic number.

It is an amenable number.

11335561 is a deficient number, since it is larger than the sum of its proper divisors (86663).

11335561 is an equidigital number, since it uses as much as digits as its factorization.

11335561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86662.

The product of its digits is 1350, while the sum is 25.

The square root of 11335561 is about 3366.8324876655. The cubic root of 11335561 is about 224.6368528837.

Adding to 11335561 its reverse (16553311), we get a palindrome (27888872).

The spelling of 11335561 in words is "eleven million, three hundred thirty-five thousand, five hundred sixty-one".