115611565 has 4 divisors (see below), whose sum is σ = 138733884. Its totient is φ = 92489248.

The previous prime is 115611553. The next prime is 115611583. The reversal of 115611565 is 565116511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 565116511 = 1553 ⋅363887.

It can be written as a sum of positive squares in 2 ways, for example, as 12974404 + 102637161 = 3602^2 + 10131^2 .

It is a cyclic number.

It is not a de Polignac number, because 115611565 - 2⁷ = 115611437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11561152 + ... + 11561161.

It is an arithmetic number, because the mean of its divisors is an integer number (34683471).

Almost surely, 2^115611565 is an apocalyptic number.

It is an amenable number.

115611565 is a deficient number, since it is larger than the sum of its proper divisors (23122319).

115611565 is an equidigital number, since it uses as much as digits as its factorization.

115611565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23122318.

The product of its digits is 4500, while the sum is 31.

The square root of 115611565 is about 10752.2818508445. The cubic root of 115611565 is about 487.1549203758.

It can be divided in two parts, 1156 and 11565, that added together give a palindrome (12721).

The spelling of 115611565 in words is "one hundred fifteen million, six hundred eleven thousand, five hundred sixty-five".