11561567 has 4 divisors (see below), whose sum is σ = 11646096. Its totient is φ = 11477040.

The previous prime is 11561531. The next prime is 11561591. The reversal of 11561567 is 76516511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11561567 - 2¹² = 11557471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11561507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42059 + ... + 42332.

It is an arithmetic number, because the mean of its divisors is an integer number (2911524).

Almost surely, 2^11561567 is an apocalyptic number.

11561567 is a deficient number, since it is larger than the sum of its proper divisors (84529).

11561567 is an equidigital number, since it uses as much as digits as its factorization.

11561567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84528.

The product of its digits is 6300, while the sum is 32.

The square root of 11561567 is about 3400.2304333677. The cubic root of 11561567 is about 226.1199600698.

The spelling of 11561567 in words is "eleven million, five hundred sixty-one thousand, five hundred sixty-seven".