115511565 has 16 divisors (see below), whose sum is σ = 199035648. Its totient is φ = 56867136.

The previous prime is 115511563. The next prime is 115511567. The reversal of 115511565 is 565115511.

It is an interprime number because it is at equal distance from previous prime (115511563) and next prime (115511567).

It is not a de Polignac number, because 115511565 - 2¹ = 115511563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115511563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295989 + ... + 296378.

It is an arithmetic number, because the mean of its divisors is an integer number (12439728).

Almost surely, 2^115511565 is an apocalyptic number.

115511565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

115511565 is a deficient number, since it is larger than the sum of its proper divisors (83524083).

115511565 is a wasteful number, since it uses less digits than its factorization.

115511565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592388.

The product of its digits is 3750, while the sum is 30.

The square root of 115511565 is about 10747.6306691289. The cubic root of 115511565 is about 487.0144224809.

It can be divided in two parts, 1155 and 11565, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 115511565 in words is "one hundred fifteen million, five hundred eleven thousand, five hundred sixty-five".