11159561 has 4 divisors (see below), whose sum is σ = 12753792. Its totient is φ = 9565332.

The previous prime is 11159549. The next prime is 11159563. The reversal of 11159561 is 16595111.

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 de Polignac number, because none of the positive numbers 2^k-11159561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11159563) 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, 797105 + ... + 797118.

It is an arithmetic number, because the mean of its divisors is an integer number (3188448).

Almost surely, 2^11159561 is an apocalyptic number.

It is an amenable number.

11159561 is a deficient number, since it is larger than the sum of its proper divisors (1594231).

11159561 is an equidigital number, since it uses as much as digits as its factorization.

11159561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594230.

The product of its digits is 1350, while the sum is 29.

The square root of 11159561 is about 3340.5929114455. The cubic root of 11159561 is about 223.4681859269.

The spelling of 11159561 in words is "eleven million, one hundred fifty-nine thousand, five hundred sixty-one".