1165353123 has 16 divisors (see below), whose sum is σ = 1698480000. Its totient is φ = 704849280.

The previous prime is 1165353113. The next prime is 1165353151. The reversal of 1165353123 is 3213535611.

It is not a de Polignac number, because 1165353123 - 2¹⁶ = 1165287587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1165353103) 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, 18918 + ... + 51851.

It is an arithmetic number, because the mean of its divisors is an integer number (106155000).

Almost surely, 2^1165353123 is an apocalyptic number.

1165353123 is a deficient number, since it is larger than the sum of its proper divisors (533126877).

1165353123 is a wasteful number, since it uses less digits than its factorization.

1165353123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71282.

The product of its digits is 8100, while the sum is 30.

The square root of 1165353123 is about 34137.2688274853. The cubic root of 1165353123 is about 1052.3313648535.

Adding to 1165353123 its reverse (3213535611), we get a palindrome (4378888734).

The spelling of 1165353123 in words is "one billion, one hundred sixty-five million, three hundred fifty-three thousand, one hundred twenty-three".