1115913813 has 16 divisors (see below), whose sum is σ = 1800466560. Its totient is φ = 600155136.

The previous prime is 1115913791. The next prime is 1115913817. The reversal of 1115913813 is 3183195111.

It is a happy number.

It is not a de Polignac number, because 1115913813 - 2²⁶ = 1048804949 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115913817) 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, 1562548 + ... + 1563261.

It is an arithmetic number, because the mean of its divisors is an integer number (112529160).

Almost surely, 2^1115913813 is an apocalyptic number.

It is an amenable number.

1115913813 is a deficient number, since it is larger than the sum of its proper divisors (684552747).

1115913813 is a wasteful number, since it uses less digits than its factorization.

1115913813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3125836.

The product of its digits is 3240, while the sum is 33.

The square root of 1115913813 is about 33405.2961818931. The cubic root of 1115913813 is about 1037.2343348046.

The spelling of 1115913813 in words is "one billion, one hundred fifteen million, nine hundred thirteen thousand, eight hundred thirteen".