1115355813 has 32 divisors (see below), whose sum is σ = 1823109120. Its totient is φ = 596840640.

The previous prime is 1115355809. The next prime is 1115355817. The reversal of 1115355813 is 3185535111.

It is an interprime number because it is at equal distance from previous prime (1115355809) and next prime (1115355817).

It is not a de Polignac number, because 1115355813 - 2² = 1115355809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115355817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46653 + ... + 66386.

It is an arithmetic number, because the mean of its divisors is an integer number (56972160).

Almost surely, 2^1115355813 is an apocalyptic number.

1115355813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1115355813 is a deficient number, since it is larger than the sum of its proper divisors (707753307).

1115355813 is a wasteful number, since it uses less digits than its factorization.

1115355813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113089.

The product of its digits is 9000, while the sum is 33.

The square root of 1115355813 is about 33396.9431684997. The cubic root of 1115355813 is about 1037.0614202392.

It can be divided in two parts, 11153 and 55813, that added together give a palindrome (66966).

The spelling of 1115355813 in words is "one billion, one hundred fifteen million, three hundred fifty-five thousand, eight hundred thirteen".