1165521015 has 16 divisors (see below), whose sum is σ = 2072037600. Its totient is φ = 621611136.

The previous prime is 1165521013. The next prime is 1165521031. The reversal of 1165521015 is 5101255611.

1165521015 is a `hidden beast` number, since 1 + 1 + 6 + 552 + 101 + 5 = 666.

It is not a de Polignac number, because 1165521015 - 2¹ = 1165521013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1165521015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165521011) 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, 4316610 + ... + 4316879.

It is an arithmetic number, because the mean of its divisors is an integer number (129502350).

Almost surely, 2^1165521015 is an apocalyptic number.

1165521015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1165521015 is a deficient number, since it is larger than the sum of its proper divisors (906516585).

1165521015 is an equidigital number, since it uses as much as digits as its factorization.

1165521015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8633503 (or 8633497 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

The square root of 1165521015 is about 34139.7278108657. The cubic root of 1165521015 is about 1052.3818987589.

Adding to 1165521015 its reverse (5101255611), we get a palindrome (6266776626).

The spelling of 1165521015 in words is "one billion, one hundred sixty-five million, five hundred twenty-one thousand, fifteen".