1099235813 has 4 divisors (see below), whose sum is σ = 1183792428. Its totient is φ = 1014679200.

The previous prime is 1099235791. The next prime is 1099235821. The reversal of 1099235813 is 3185329901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3185329901 = 13 ⋅245025377.

It can be written as a sum of positive squares in 2 ways, for example, as 71199844 + 1028035969 = 8438^2 + 32063^2 .

It is a cyclic number.

It is not a de Polignac number, because 1099235813 - 2¹⁸ = 1098973669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099235843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42278288 + ... + 42278313.

It is an arithmetic number, because the mean of its divisors is an integer number (295948107).

Almost surely, 2^1099235813 is an apocalyptic number.

1099235813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1099235813 is a deficient number, since it is larger than the sum of its proper divisors (84556615).

1099235813 is an equidigital number, since it uses as much as digits as its factorization.

1099235813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84556614.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 1099235813 is about 33154.7253494883. The cubic root of 1099235813 is about 1032.0410130952.

The spelling of 1099235813 in words is "one billion, ninety-nine million, two hundred thirty-five thousand, eight hundred thirteen".