11153561 has 4 divisors (see below), whose sum is σ = 11261952. Its totient is φ = 11045172.

The previous prime is 11153533. The next prime is 11153563. The reversal of 11153561 is 16535111.

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.

It is a cyclic number.

It is not a de Polignac number, because 11153561 - 2²² = 6959257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11153563) 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, 54041 + ... + 54246.

It is an arithmetic number, because the mean of its divisors is an integer number (2815488).

Almost surely, 2^11153561 is an apocalyptic number.

It is an amenable number.

11153561 is a deficient number, since it is larger than the sum of its proper divisors (108391).

11153561 is a wasteful number, since it uses less digits than its factorization.

11153561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108390.

The product of its digits is 450, while the sum is 23.

The square root of 11153561 is about 3339.6947465300. The cubic root of 11153561 is about 223.4281291097.

Adding to 11153561 its reverse (16535111), we get a palindrome (27688672).

The spelling of 11153561 in words is "eleven million, one hundred fifty-three thousand, five hundred sixty-one".