11561597 has 4 divisors (see below), whose sum is σ = 11568576. Its totient is φ = 11554620.

The previous prime is 11561591. The next prime is 11561629. The reversal of 11561597 is 79516511.

It is a happy number.

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: 79516511 = 227 ⋅350293.

It is a cyclic number.

It is not a de Polignac number, because 11561597 - 2¹⁰ = 11560573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11561591) 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, 572 + ... + 4842.

It is an arithmetic number, because the mean of its divisors is an integer number (2892144).

Almost surely, 2^11561597 is an apocalyptic number.

It is an amenable number.

11561597 is a deficient number, since it is larger than the sum of its proper divisors (6979).

11561597 is an equidigital number, since it uses as much as digits as its factorization.

11561597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6978.

The product of its digits is 9450, while the sum is 35.

The square root of 11561597 is about 3400.2348448306. The cubic root of 11561597 is about 226.1201556486.

The spelling of 11561597 in words is "eleven million, five hundred sixty-one thousand, five hundred ninety-seven".