1165213361 has 32 divisors (see below), whose sum is σ = 1380220800. Its totient is φ = 974177280.

The previous prime is 1165213351. The next prime is 1165213367. The reversal of 1165213361 is 1633125611.

It is a cyclic number.

It is not a de Polignac number, because 1165213361 - 2³⁰ = 91471537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1165213367) 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, 538121 + ... + 540281.

It is an arithmetic number, because the mean of its divisors is an integer number (43131900).

Almost surely, 2^1165213361 is an apocalyptic number.

It is an amenable number.

1165213361 is a deficient number, since it is larger than the sum of its proper divisors (215007439).

1165213361 is a wasteful number, since it uses less digits than its factorization.

1165213361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2289.

The product of its digits is 3240, while the sum is 29.

The square root of 1165213361 is about 34135.2217072044. The cubic root of 1165213361 is about 1052.2892941102.

Adding to 1165213361 its reverse (1633125611), we get a palindrome (2798338972).

The spelling of 1165213361 in words is "one billion, one hundred sixty-five million, two hundred thirteen thousand, three hundred sixty-one".