1183355813 has 4 divisors (see below), whose sum is σ = 1185351948. Its totient is φ = 1181359680.

The previous prime is 1183355791. The next prime is 1183355827. The reversal of 1183355813 is 3185533811.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3185533811 = 3511 ⋅907301.

It can be written as a sum of positive squares in 2 ways, for example, as 483912004 + 699443809 = 21998^2 + 26447^2 .

It is a cyclic number.

It is not a de Polignac number, because 1183355813 - 2²⁴ = 1166578597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1183355213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 997178 + ... + 998363.

It is an arithmetic number, because the mean of its divisors is an integer number (296337987).

Almost surely, 2^1183355813 is an apocalyptic number.

It is an amenable number.

1183355813 is a deficient number, since it is larger than the sum of its proper divisors (1996135).

1183355813 is an equidigital number, since it uses as much as digits as its factorization.

1183355813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1996134.

The product of its digits is 43200, while the sum is 38.

The square root of 1183355813 is about 34399.9391423880. The cubic root of 1183355813 is about 1057.7225974676.

The spelling of 1183355813 in words is "one billion, one hundred eighty-three million, three hundred fifty-five thousand, eight hundred thirteen".