1165531215 has 32 divisors (see below), whose sum is σ = 1903227840. Its totient is φ = 608864256.

The previous prime is 1165531207. The next prime is 1165531217. The reversal of 1165531215 is 5121355611.

It is not a de Polignac number, because 1165531215 - 2³ = 1165531207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165531217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 801429 + ... + 802881.

It is an arithmetic number, because the mean of its divisors is an integer number (59475870).

Almost surely, 2^1165531215 is an apocalyptic number.

1165531215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1165531215 is a deficient number, since it is larger than the sum of its proper divisors (737696625).

1165531215 is a wasteful number, since it uses less digits than its factorization.

1165531215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2523.

The product of its digits is 4500, while the sum is 30.

The square root of 1165531215 is about 34139.8771966157. The cubic root of 1165531215 is about 1052.3849687061.

Adding to 1165531215 its reverse (5121355611), we get a palindrome (6286886826).

The spelling of 1165531215 in words is "one billion, one hundred sixty-five million, five hundred thirty-one thousand, two hundred fifteen".